Thats just wrong.
Both statements are incorrect. Like just about everything, its not that black and white. In many fields there are likely countless anecdotes suggesting that performers are not fans, and others suggesting they very much are. But people like big, loud statements and aren't on board with exceptions or contrary evidence that adds any kind of nuance to such discussions.
Some performers are clearly fans, that is undeniable. Listen to Waltman or Bret or Austin talk about watching footage.
Listen to Rivers Cuomo talk about other music. Performers can be fans.
Saying performers aren't fans in any art is a plain wrong statement. I never asserted the opposite, that all performers are fans, that isn't true either.