I'm speechless. With one finger bass playing, it is entirely possible of course. I'm just amazed at his determination. Shows that you can do anything if you put your heart to it. Not many people with one hand will want to take up the piano.
Let's see somebody that the same with a guitar... This guy will need a left-handed guitar and a hook designed to strum to do that. I wouldn't be surprised if he pulls that off as well.