Just because someone is wrong doesn't mean that you have to argue with them, or that you can't learn from them. I train in the gi, but I use RG all the time. The point is that overall, he is a black belt, and you are a white belt. Ignore what you disagree with, or bring it up on here to figure out how to use other methods. But mainly, learn his traditional style of bjj because it will help your entire game ... even your RG. Then, you can cross train with 10th planet, or experiment with things like RG during open mats. And when you get a purple belt or so, you can move to another gym to get exactly what you want (now that you know specifically what you want).
Also, check out Marcelo's place, it's amazing.
Also, check out Marcelo's place, it's amazing.