Yeah I remember people saying the Predator 2 novelisation said that he had radiation poisoning after the blast, which is really one of the only things I disliked about the lore Hunting Grounds added. Like I get why they did, because it was there in the book, but I've always hated the idea of the Predators self-destruct being radioactive.
And yep, pretty much every character in every action story has some degree of plot armour or another. It's all just a matter of degrees.