I like to think I'm a somewhat experienced Stepmania player, and I can assure you that, for the life of me, I cannot tap the arrow keys nearly as fast as that. Nor can I tap as lightly and as fast. Plus looking at what he's trying to do makes me think he doesn't know how to play bullet hells - the guy doesn't stream anything that's stream-able, and he moves to ridiculous places when he shouldn't be moving much at all.
I'm not sure cap rates can work as an argument since PCB only remembers the attempt after clearing the level. He could have been trying for weeks, or he may have just picked up the game.