Two important notes that I think are important:
- First he basically did nothing but this for a year, most of us don't have this luxury. And while I haven't played it myself most of the reviews indicate that it's just a reskinned version of Dragonborn.
- Second he said he created it when he really just brought a bunch of people together to build the pieces. Just look at the credits, other than voice actors and bit pieces he really doesn't acknowledge anyone else other than voice actors. Last I checked people who take credit for someone else's work don't last long.