To my eye that looks like a perfect tackle that just happened end up with Bowers’ opponent’s head hitting the turf at force. But if I was administering a sport worth a couple of billion dollars a year, understood the science of concussions and their long-term effects, and understood how liability works, I might also be reluctant to admit that a ‘perfect tackle’ can be a direct cause of the brain scramblies.
From a liability perspective, a sport where a ‘freak accident’ might cause a concussion is very different from a sport where executing a skill of that sport perfectly causes a concussion.