I don"t have now but there were several articles about such a decade ago. Also especially the 'morning zoo' type prank calls etc but also for others.
I am pretty convinced that the majority "news guests" that are always on in the first 15 minutes (Curtis, Bloom, Corsi, Dr.Sky, Austin-Fitts etc) are all in a partnership deal with Geroge where he has them on and they promote their site and they pay him in return. He always highly promotes it though C2C twitter which also is mostly used to promote his other scams he's involved with (dating site, cryptocurrency etc)
If this callers are fake, it wouldn't surprise me, there's no doubt it's so heavily screened. There not much of a difference if it just fake callers as well.