Yeah, but did you see how many times he smacked the screen up against the tank with a lot of force? I have owned lots of phones in my day, but ALL of them would have had a smashed screen with just one hit lighter than the force he was using. The iPhone has a more rugged screen than lots of others, but I will bet anything that one smack against the tank like that, and the screen would be done for. Even though he cracked the screen, that thing held up like a tank! After seeing that, I would have confidence that if that phone fell out of my pocket and fell in the rocks, it would survive in tact. I can't see how a fall out of a pocket could exert that much pressure repeatedly.
So in normal circumstances, yes I would still consider this phone unbreakable.