I suspect that your question raised some legal concerns that the company did not want to address.
As expected they ran from that big time. But , to your point they claim that it may reduce concussive force. I have seen no product in any genre that claims to prevent a concussion.
FWIW - I spend time around people who make their livings jumping out of perfectly good running airplanes and many are starting to wear TMJ splints (mouth guards) to protect from opening shock and landing.
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