The phrasing is stupid and kinda wanky if it's meant to be taken literally.
You don't resist getting all your cells killed by "resisting instant death" especially since there's clear clarification that the instant death is caused by different effects which ilicit different required resistances.
In this case , that shit wouldn't work against any regen worth its salt.
You just need regen for example, you don't need "instant death resistance" .
Or for other shit listed there, you just need some good mindfuck resistance.
er it bypasses regen in overlord, trolls are able to regen even after being fully minced and reduced to hamburger meat (They use old school troll rules where they literally just don't fucking die), ainz passive death aura instantly kills them.
From overlord volume eight page 249:
“Well, that’s a Troll for you; with their regeneration, they can even come back to life after being reduced to mincemeat."
And volume eight page 135:
“Ah, this ~su? Kinda looks like an uncooked hamburger patty, doesn’t it? All it needs is a good charbroiling.” A ball of blood-spattered meat shifted and twitched under the bloodied head of Lupus’ crozier. There was nothing about the pile of broken flesh that suggested that it had once been a Troll. However, what made it disgusting was the fact that it was slowly regenerating, and still breathing.
Ainz aura bypassing it page 250: [Despair Aura V (Instant Death)]. The surging aura billowed out from Ainz. The Trolls, Ogres and Guu went limp and collapsed like puppets whose strings had been cut, slumping to the ground. The fallen monsters did not move. It was clear that although their bodies were still warm, the flames of their life had been utterly extinguished.
Saying that instant death is a very complicated subset of abilities, that seem cover everything from having your soul devoured, having your life simply stop out of severe fear, to falling into a hole in the ground and instantly dying because the rules of the spell say thats how it works. (That last spell is also technically divine)