It was interesting, thought I didn't get all the way through it.
I do think that there have been many changes made over that last few years that are positive for the game, namely most defensive coaches at all levels moving to rugby style tackling. Coaches have been teaching against leading with the head (on both defense and offense) for years, but rugby style tacking teaches keeping the head completely out of tackling (no more head across the ball carrier) and I think this will help. Of course, players will just react sometimes and the head will get involved (like Barnes vs KU that got him hurt last year).
Also, while I agree there is head to head contact some along the line, for the most part both defensive and offensive linemen are taught to use and lead with their hands so I don't think head to head contact happens a lot even in run blocking.