The populaiton of people I talk to about this is highly filtered, so I can't find any. You'd have to survey people who actually buy his stuff. I can say that when I get out of my little bubble and talk to people outside of it, I am surprised in general at how different people's conceptions of reality are. There are people who think the Earth is flat, and that lizard aliens are running the illuminati. I wouldn't be surprised if there are a significant number of casual exercisers who just don't know the difference.
That said, I can't point to any population of people that I know worship the liver king and all that he says as gospel.I think trying to go find that cult might be investing a bit too much on my end.