Me and Hobbit were talking on chat about it earlier and I found that link and came to the conclusion that the only way to find out what happened was to ask the other riders.
I have ridden a clone of it and it seemed pretty safe but he could have climbed out of the restraintif he was very bendy or if it was not locked down enough.
My guess is suicide if there were others on the ride.
If not then the park is lying to protect itself.