Here's a better example of a factually incorrect clue being disallowed.
Category: SHORT PEOPLE
Clue 1: Wilt Chamberlain
Clue 2: Randy Newman
Both are factually incorrect. (Randy Newman is six feet tall.) Clue 1, hypothetically, wouldn't get buzzed even though it's factually incorrect. I'm 90% certain that Clue 2 was actually given on the 20K, and it was buzzed. It wasn't just factually incorrect; it was also a description, of sorts, of the category. Had this celeb said, "Randy Newman's enemies," it might have been permitted.