Thomas Shey
Legend
It's been a known thing for around 25 years of discussion about RPG play and design. I'm guessing it started on use-net? I linked upthread to a Forge essay from the early 21st century that tried to regiment some of the terminology that had emerged by that time.
It was, as far as I can tell, a rec.games.frp-advocacy creation. Note that as I said the usage you've been quoting seems to have collapsed some of the terms (which included, in no particular order Token, IC, Deep IC (aka Immersive), Actor, Director).