Too hard to say - perspective and all that. And some guys/people do have lengthy thumbs (women, I've noticed), if not 5". I can't for the life of me see where the P'Shop is happening. As for the tape, it looks like a genuine builder's retractable. But I'm a novice, you'll have to advise me.Scale it against his hand. Does he really have a 5" thumb? Does anybody?
These next pics, same guy (from a similar thread, elsewhere, here), might help the truth of things (note: gay stuff so please don't click if you're offended by images of anal sex)..