i get this too, its one of the problems with being a ronin, i had to put up with a 15 minute speech of how 10th planet moves like rubber guard, puts the body in positions that the body shouldnt move in and if your body doesnt anturally move in that way then you shouldnt do it. and then how hes talked about it to high level black belts and said that while the moves work on lower levels, it just doesnt work on higher levels at all...
its the most frustrating thing for me.
in this case, like bobby said, it was probably just good natured ignorance. there are soo many moves in jiu jitsu its impossible that everyone will know about everything.