d2 is really brittle compared with some plain carbon steels , no doubt of that , but you can not expected that you break it with nomal choppings in comfort temp.
even more brittle steel , like M4 , you can not easily break it with wood choping , above vid is nothing(harden steels with rounded edge , cut unhardened steel ,like vice panle , is not a challage for the steel , all hardened steels can do that , and bending in a vice is nothing with thoughness .) .
so , my conclusion is that the D2 is not suit for big chopper or any hard use oriented job, the break is unexpecting , but you will get big chunk of chips or break it when you treaded your blade hard .