I don't consider myself some kind of "pro gamer", so I don't expect reviewers to be any better than I am, really. You don't need to have cutting-edge reflexes to get a feel for how well-put-together a game is, nor beat the most difficult settings.
But this video is hilariously bad. The time he spent seconds in on the 2nd point of the tutorial, where he had to jump and air-dash over the next pillar, jebus. That's where it goes from "not a pro gamer" to "does this person PLAY video games?"
I love Cuphead's art, but the game type isn't my favorite and I probably won't pick it up (unless SUPER cheap or in a humble bundle or something). I'm not averse to difficulty; I played and enjoyed Super Meat Boy. But that's a different kind of game.