No, he said he doesn't play them AFTER they release. But he plays them constantly when they're in development. One of the difficulty rules at FromSoft is that each boss and area has to be beatable by Miyazaki (which he said is a good baseline, because he likes challenge but doesn't consider himself good at games).
I wonder who he does consider good at games. FromSoft games are so hard that Dark Souls is a synonym for "really hard game". If someone can beat one of those games, I think it's fair to say they are good at games.