Well, I'd believe that some of them might believe it. There are almost as many crazy myths/beliefs in the BB world as there are amongst the Oprah watching housewives.
A bodybuilder told me the other day that he covers himself in Preparation H, and gets in a tanning bed - so that he'll lose fat.
(note, he didn't say to temporarily reduce appearance of fat, or make his muscles look more cut for a competition - which I don't know if it would even do that or not)