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First, that's not a useful question to ask, primarily because it's nothing you can control in any reasonable way.

Second, just because some graduate students have somehow come up with such statistics does not imply that your average competitor has. It's a bit similar to the average physicist not having published three papers at the age of 27 all of which could have gotten a Nobel Prize on their own -- even though Einstein did. You will always have people who are far better than everyone else, and they will likely get positions somewhere, but they're not going to fill all available positions.

Finally, publications are just one measure search committees use to determine who to hire. There are many questions on this forum that discuss the many many other criteria used, so I won't repeat them, but you might want to read through these other posts to see that publications are really just one of many criteria.

As someone who got 6 publications during their PhD - it's often because they are of low quality. I (wrongly) placed a large focus on quantity over quality and it resulted in a rather lacklustre thesis.

Some people are able to get large numbers of high-quality publications, but they are so much more rare than people who get large numbers of papers that will never be cited or even read by anyone of note.

It's good to have some publications - but it's better to ensure that the research you are doing is of value to the field!

There are some institutions where there is common practice to put ones peers as co-authors even if they had nothing to do with it. On top of this, there are these "paper-producing factories" where the main objective is just to produce paper after paper.

I'm not saying that these individual geniuses with these citations honestly doesn't exist, but personally I'd be cautious about just accepting them right away as the truth and instead consider a bulk of them to be untruthful.

How did they do this?

One possible explanation is that people sometimes stumble over a vein of gold. You make a small breakthrough with a new idea that you can then expand in different directions, apply it to and combine it with other phenomena, often in collaboration with experts for those phenomena.

The obvious follow-up question is to find such a vein of gold. Luck might be an important component here, but a good intuition might play a role as well -- sometimes, the intuition of the involved advisor and collaborators. For the collaboration aspect, an advisor with a strong network, as well as good networking skills of the PhD student can help.

Citations are not always the best of indicators. In my post-doc position I was co-author on a paper that had a "whacky new" idea. We didn't really develop it too much. We just said "hey, you can use this thing here to solve that problem over there, isn't that interesting?"

So this has resulted in a lot of people saying "yes, and if you tidy it (Reference [1]) this way and add this feature, you can get an interesting variation on it like so." Where [1] is the paper I was co-author on. Some thousands of papers have done some such thing. And I was alphabetically the first author. Though I was quite clearly the least contributor.

So I technically have an excellent citations stat. But I left academe after my post-doc, and barely remember doing this work. So I'm absolutely not good material for being a prof. Both my co-authors have distinguished careers. But they were both established before this paper.

There are some topics which are inherently good for publications and citations. If you need a specific dataset for your study, this is quite often very difficult to build up. So if one does the work, a lot of people will use and cite your dataset. Even more so, if there are only limited ways to gather such a dataset, especially if you need patients with a specific disease or something like that. In these cases the academia is happy for any dataset they can have, and therefore it gets easily published.

If you look at the published papers, there will certainly be some paper on "here we made this dataset, feel free to use it and cite us", then after this comes the "we now evaluated this dataset with our methodology" sometimes followed by "with this methodolody we made this workflow and product" and so on. Sometimes accompanied with some more datasets, and then you have 10 publications in short time. Each of them building on a reputable and much cited dataset. So these paper gather good traction also.

I was at conferences where half the people just presented new datasets of gazes, pupils, fingerprints, smiles whatever. A lot of tedious work to build up, but it may be a good thing to build up reputation.

Sadly in the current times, reputation in numbers (citations, papers, etc) are sometimes regarded more worth then the content of these numbers.

This is highly dependent on your research topic, publishing culture, and local standards. I will try to answer from personal experience.

As a PhD student I have published 15 papers. Roughly the same amount of manuscripts came from work developed during PhD, while others derived of work done as an undergrad and Master student. All of which were published in reputed peer-reviewed journals, though mostly low-tier journals.
This is how I achieved this: (i) passionate about research; (ii) passionate about writing and editing papers; (iii) some equally passionate co-authors; (iv) working like crazy; (v) being stubborn like a mule; (vi) prioritising descriptive reports within a small research niche; (vii) getting completed work published.
I had finished my PhD with roughly 60 citations. I don't think I have a good citation record nowadays, but I have published many papers.

Did that help me in my career? Sure it did. Academia is hungry for publication counts almost everywhere, and prospective postdoc supervisors assume you'll earn them at least that. Most PIs are scared of unfinished projects, and depression-stuck collaborators.

However, how such numbers are seen varies between different academic cultures. Therefore I cannot say whether I'd specifically recommend this path to anyone. You wouldn't believe the stress (and politics) involved in pushing things forwards, especially if you work with rather laid-back mates.

The key point to keep in mind is: how can you show value? Focus on that.