His stuff IS overcomplicated and this teaches bad habbits to beginners, people play with the rubber guard and forget about the basics of BJJ, hip movement, framing etc. Its also leads to people even good guys forgetting about the rest of the game, I cant count the number of fighters that my coach has had to retrain coming back from his place
But the basic thing is he is overhyped and hasn't produced any really good grapplers in years, go with guys that produce good grapplers and teach the basics over and over