Very possible, he is doing the blind 540 his natural way and for anyone who has done a un natural sw up your body just wants the 2 out and the 4 out is easier. I don't find this hard to believe at all, but either way that is one sick ass trick.
I would not call that a 540 switch up it was more of a switch up to 360 switch up rail tap 90 out so a 450 i guess but still if he lands it clean he could easily join traveling circus.
Haha this is turning into a scaled down version of the "How do you get to chads gap from the bottom of alta?" thread. The only thing left is if the kid posts the vid or not