God bless the "Ignore" button.
I've only been to this attraction once. But it is simply chock full of "ringers". Both the "music business" hosts with the false back-story, and even some of the "guests" when they can't find 5 people (most days, I'm guessing) are simply performers. No sadness here if it retires.
The performers are good but they've been given a bad part in this show. The college bro from no college anyone ever heard of who can sing a 3 year old pop song a little too well. The pretty-in-her-own-way shy 20-something office worker who sings Colors of the Wind well but needs more practice.
If you reread the quoted section, you'll see that Crazy Omurice (is that name supposed to sound like "Old Maurice"? Because it's apt.) is specifically mentioning the contestants.When he says "performers" I believe he is referring to the host and the judges.
Now, having been one of the singers and talking with the cast members, many DO have other responsibilities around the parks.
Further, I think it's inane to expect the judges and host to actually be who they're portraying. No, chances are the Simon-esque host is not actually from London, much the same way that Christian Bale isn't actually an orphaned billionaire playboy with a leather fetish.