I find his videos entertaining, but I also think this f*** GTO thing very misleading. And I recall he recently made a video explaining how his crazy exploitative moves at the micros are only a small part of his play and the videos are heavily edited and how beginners shouldn´t be trying to emulate him and that poker requires lots and lots of talent and so on.
People in general, even beginners, would be better served (imho) by having a strong theory foundation and then putting hours and hours of proper practice. And then, only after all of this, try to figure out ways to deviate and exploit ppl mistakes. Doing this they would develop strong pattern recognition skills over time. Just my 2 cents obv, the guy seems to crush, and I´m still stuck in 5nl and 10 nl.