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You'd be correct. I don't know if this is any particular trope since it's kinda disconnected from the show itself (though there probably is one I just don't know about), but it's definitely not Creator Backlash.
It is permitted to list miscellaneous trivia with no corresponding Trivia Item on trivia subpages, so this could just be listed directly.
Suddenly I'm... still rotating Fallen London in my mind even though I've stopped actively playing it.There was a TLP draft for "Subject Backlash"
that could fit something like this (an IRL person publicly disliking how a work portrays them), but it didn't seem to take off; activity on it ceased last October. As it stands, I can't really think of any currently-available tropes that could fit this, so for now, it'd probably be best to just leave it off the page.
Like ^^^ said, it can just be listed directly. See Trivia.The Dragon Prince for an example.

On the TV show Euphoria, there's a joke about a character being a One Direction fangirl who wrote Louis x Harry fanfiction - complete with a fully-animated Imagine Spot sex scene. The real Louis Tomlinson has made it known that he really didn't like the joke.
This was originally noted on the Trivia page
for Euphoria under Disowned Adaptation. I deleted it because Disowned Adaptation is "Creator rejects adaptation of original work," not "Celebrity doesn't like a Real-Person Fic joke about themself."
It's since been re-added (not by the original Troper who added it) under Creator Backlash, which I'm pretty sure is still misuse, because that's "Creator comes to hate their own work." Am I right in this line of thinking? I don't want to delete it again and start an edit war, but it seems like shoehorning.
Edited by iamconstantine