Guy is strong, but he's no where near one of the strongest bar athletes in the world. Most of the skills he's doing there are done with sloppy form, which makes them easier, or fairly low level from a gymnastics standpoint. I do agree though that bodyweight training can be great if you know how to progress with it and are willing to put in the time.
Now this, this is someone who is truly exceptionally strong on bodyweight skills:
This guy's pretty strong as well:
Not bad either: