That's not plot armour though; plot armour is to be expected reasonably to die in situation x (like being attacked by 1000 enemies) and not die only because you aren't meant to. Compare with someone (in the same story) not dying because they actually do stuff not likely to lead them to deathIf you know the story, then everyone has plot armour.
PA is a literary bug, not a feature; only harms the system it's in, which wasn't the intention.