Yep it doesn't surprise me, I've seen many people claim "death threats" to get out of responsibility for doing or saying something that was not respectable, or that was flat out evil.

They do this because it works very well, death threats are so serious and so scary that if somebody said they got them you would immediately give that person a pass (unless they're a Nazi then they deserve it, you don't give Nazis a pass for anything) no proof required, though it also would be incredibly easy to forge proof of such an event for anyone skeptical and it would be enough for 99% of people, the remaining 1% of dissent would then be written off as crazy people.

I'm willing to bet that this will continue to happen and people will continue to go along with it because there are enough cases of people making real death threats to innocence cover up the false ones and make them seem more real than they actually are.