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He's probably talking about split brain patients. Here's a video by CGP Grey about them: https://www.youtube.com/watch?v=wfYbgdo8e-8

Yep.

AFAIK, the part that's been debunked is that there's a complete separation of concerns between the two hemispheres. From studies on split-brain patients, there does appear to be some specialization, but it's much fuzzier than "right brain does art, left brain does analysis" or anything like that.

>Because I thought that was pretty well debunked.

Only when it comes to "left/right side analytical/creative" split, and even that mainly based in a single 2013 study, which could have all kinds of issues. Not regarding different functions in general.