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While I don't know if there was ever a specific TRS thread about it, I can say that the trope as written is, indeed, purely a gaming trope. Having a character in cinematic or written media die when their head is blown off is Like Reality, Unless Noted, and therefore not notable under this trope, nor is its aversion.
Exceptions could be made for when the trope is specifically referenced or discussed in non-gaming media, or if the media in question exists in an RPG Mechanics 'Verse where characters explicitly have hit points.
Edited by Fighteer "It's Occam's Shuriken! If the answer is elusive, never rule out ninjas!"

Could we have some people chime in on this discussion on the Chunky Salsa Rule here
?
Another troper and I are just going in circles on some specific examples, and non-gaming examples were unilaterally cut a while back.