Straightening yourself after hard braking isn't going to be done so hard that you break your spine on a bolt behind you.
Read. Loren. READ!!! No one has claimed that the injury from the bolt is the one that broke his spine.
Holy shit, this is how excuses are done, is it? Ignore the actual evidence and refute some made-up version of the evidence that you think is easily refuted (even though that is sadly done anyway)?
The report said that the broken neck injury was a hyperflexion one - like your chin flying up and back as in someone who was punched in the jaw. That direction. Exactly what you'd expect in the diagram of the van if he were pitched forward face-first against the wall.
The report went on the say that the bolt injury was an additional injury that showed he was being tossed about in the van.
Then,
add 2 + 2.
See if you can still only come up with the square root of -3, because that's what it sounds like you are selling.