You don't become a good keyboardist just because you can play a few keys fast. Absolutely ruined the feel that the song carries with your mechanical playing.
Yes, in fact he did some mistakes playing "fast" but he is not Yanni in first place. I think that what you tried to said was that he should pay more attention to the feeling he put on his interpretation, more than the speed hi showed, but beside that it was a good try or not?