Right, didn't catch that nuance. His post is as detailed as his videos, a skimmed rather quickly.

south_korea_ln

 not hiring mathematical positions, he's helping companies hook up with talent in his audience base.  If I were an employer, I know that someone being a fan of 3blue1brown is a pretty big positive signal (they'd obviously have to back it up with technical chops though)

science

3Blue1Brown : "Recruiting, both for myself and for other companies"

It sounds like *he's* not hiring mathematical positions, he's helping companies hook up with talent in his audience base.  If I were an employer, I know that someone being a fan of 3blue1brown is a pretty big positive signal (they'd obviously have to back it up with technical chops though)