Shock! Short piece of metal harder to bend than longer piece of metal.
Call all the physics journals and tell them to hold the front page.
The other phones he has tried to bend don't have a flat back to them. The compound radius will deflect the bending.
These other phones are also thicker. Not a proper test.
On the flip side, that'll teach you for buying a ridiculous sized phone. Apple should never have made the 5.5" iPhone. It's just making the Android...