That video demonstrates what happens when you try to land in the ocean while you are fighting with hijackers which causes a sudden dip to one side, when you happen to be over a coral reef for the engine on that side to hit. Even with that, the crash was quite survivable. A large number of the fatalities were due to drowning, because people inflated life rafts while still inside, which blocked them in so they drowned when the plane sank.

This is probably not a good crash to use as a baseline for predicting what would be typical for an ocean landing attempt.