As said above he's put in the hours and knows about music, can play piano, has busked, studied, and put himself into all sorts of band/musical situations in order to learn.
If he was to put an album out I doubt it'd be an hours worth of the sort of blistering material that he crams into his 3 minute videos, I for one would buy it.
He's achieved what I believe the majority of us on here would probably like to achieve and most likely would try if given a different life/universe, and joined the ranks of the most well rounded players on the planet at this point.
Kind of a Guthrie Govan for bass. I buy his stuff too.