2nd video: Thats pretty bullshit and not because the 222 is not balanced but how vehicule crits are fucked right now... it seems that if u deal a crit with a "killing blow" u wont actually kill it but inflic the crit instead...
Death is a crit in this game, if the blow doesn't roll a death-crit, the unit will not die. Health only serves to determine what crits you get. Usually health damage, at very low health the crit rate increases, and at 0 health there's an extremely high chance of death crit, low chance to decrew, and low chance for any other crit.
You should have been here in CoH1 when there was small chance for no crit at 0 health, that was funny (and frustrating) stuff! https://www.youtube.com/watch?v=VnHfG6jYjpM