I certainly don't know any facts that aren't apparent in the story and video, but I certainly have difficulty believing that a high-speed get-off could crush the back wheel, seat frame, and exhaust like that but not do any damage to the front of the bike or fairings. It sure looks to me as if he was rear-ended.
Of course, historically, the police are the first to admit when they make mistakes, so I'm sure the investigation was thorough. Not.
I also find the insurance situation strange. Why wouldn't health insurance cover him if the cycle insurance did not. It's entirely possible that he only had the minimum liability insurance on the bike. Given what it must cost to insure someone his age on a ZX-9 it's understandable that he minimum coverage, but it would be pretty dumb.