If it was anybody but Jon (like maybe amost of the people who've replied to this post) I'd say it was a fake. When you can do it, you take a pic and show you can. If you can't, you say it's a fake. Simple enough. I've seen the guy do stuff with a plane that wasn't inverted hovering, and if I didn't know better I'd say that was faked. It wasn't.

Nobody said we was flying it around, just that it hovered, momentarily, inverted. Nobody said he had total control. There might not have been enough airflow over the surfaces for control, but I still say that if this particular guy said it hovered, even briefly, then it did.