I can kinda see a case for the "it was a non-sincere nazi salute" argument, as it does seem like the sort of thing a petulant manchild might do. But I can't believe there are people who watched that and legitimately think it was intended to be any other gesture.
I don't know that it makes a real difference though. Fuck anyone supporting him at this point, regardless of the justification they're using to do it.
If "as discussed" is the most ridiculous thing he's ever heard, he should start listening more.