I wonder if this is even a real thing outside of the internet.
I wonder this too. But I've started to see the storygamer proclamations outside the net now and can about tell what faction they got their ideas from by what they quoted.
Its also gotten into board gaming and fairly regularly someone will solemnly proclaim Arkham Horror is a really real RPG because they made up a story about the random things that happened while playing. They didnt do any actual role playing while playing. But "I made up a story" makes it an RPG because their idea of RPG is Storygame.
And because Im an equal opportunity idiot slapper. RPG players are guilty of doing this to board gamers too. "Look! This game has units with STATS! Its an RPG!" and every god ever wept.
Or the ones that take it to the Nth degree and role playing (really storygaming) is now defined as "everything on earth" because you can make a story out of anything.
This is part of why theres such conflict between RPG and Storygame. Side B is trying to co-opt side A.
Now replace story game with solo game and scream.
Personally I reserve actual hostilities only with those who try to conflate a meaning to "everything on earth" and especially with those fuckers who are co-opting whatever not because they believe it. But so they can sucker people into buying their product or so there can be more of their thing.