ok, I'll break it down for you.
If a mech were to jump off the roof of a ten story building and land feet first, in the real world it wouldn't do much damage to the armor because it didn't land on the armor. but it would jack up the joints and structure of the legs.
Now if the mech trips and falls on it's ass, it would probably bang up the armor that it lands on, but could still do damage to structures under the armor. so it would do damage to both.
At no point did I ever say that falling wouldn't do damage to the armor. I was refuting your claim that there was no way to model fall damage realistically in a game, and that the only way to model fall damage would be to apply it to the armor as if it were the same as getting shot.