> What do data scientists do?

The title is very broad and it could mean a bunch of different things at different companies. But it almost always involves a solid understanding of statistics, hence the probability questions in the interviews.

GP might have been asking a rhetorical question. A data scientist's job is literally figuring out what they are "supposed to do with [...] probability related word problems".

So from the article, it seemed that the interviews were quite relevant to the jobs advertised, and that the applicant truly was not a good fit for them.

A bit interesting that he reacted with:

> about 20 of these in-person interviews going poorly ... it seemed like everyone I interviewed with was a caricature of narcissism and delusions of grandeur.

instead of reflecting over if maybe maths is actually on topic for a data science job.

It's also odd, I think, that the companies didn't ask some probability questions in a phone screen, saving time for him and themselves.

Data scientists also do a lot of SQL queries. The point is that this guy appears to have explained why he's not getting offers in the blog post, possibly without realising it: maybe he doesn't have the skills he claims to have.