The video is 100% fake. If you look, you'll see that he "artfully" inserted alternate angles of the drop. The demolished phone was inserted and made to look like a pristine was being dropped. To be done properly, it should be one continuous shot.
Plus, the angle at which the main action is shot would preclude the alternate angle being simultaneously shot without the photographer being in the frame.
He also oversold the damage. It would have been more believable if the watch had a few fractures. This one clearly had been hit by a hammer.
It's amateurish as this sort of thing goes, and the nimrod who posted it is probably getting a big kick out of the one million+ hits. I guess some folks are attention starved.
You are correct, though, even though fake, that sort of drop would be exceedingly unfortunate and unlikely. And besides, I've owned watches for decades, and cannot remember a single instance where I've dropped on one a hard surface.