Its not an act. Hes been around for years, and has 200,000 views and thousands of subscribers. How you think someone's gonna fake it, when youre *watching* his fingers on the keyboard like that. The way he moves is natural in itself.
Also, im sure you can "rap" over the beats, but i bet no one here will sound "good" over them. as in, be good enough to get put on the radio or something. if theres a professional here then take my mp3, rap over it, and then let us judge for ourselves