Yep.

And if anyone doubts this, 15 years ago I had made a tool that created these types of profiles as a proof of concept.

I had scraped tons of subreddits, then you could pass in a user and based on both their subreddits and key words would categorize users across a few axes. That was just using naïve bayes, but worked pretty well.

The AI is just much much better at natural language processing to pull out more detailed info about patterns.