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I think the fanfic/ namespace is getting misused here, but I'm not really opposed to the troper page being used this way.
Link to TRS threads in project mode here.
Fanfic/ is definitely misused if it's about a writer and not a specific work or series — although there are precedents with WebAnimation or WebVideo/ compiling the works of the same creators, and not so much about the authors themselves.
But yes, moving such pages to Creator/ when possible is certainly best.
Aren't Troper pages reserved for use by the troper themselves, to the point of being uneditable by anyone other than the troper and the mods? If that's what you're talking about, I don't think another troper ought to be trying to "move" this content to another page.
If you want to make a Creator page for a fanfic writer based on the information you have about them as a creator, then that seems perfectly reasonable, whether or not the author is also a troper. However, in my opinion, linking that to their status as a troper doesn't seem appropriate—the fact an author uses TV Tropes is unlikely to be at all relevant to their works.
Fanfic writers that are tropers, should use Creator pages, no?
Since Tropers pages are for Troper things, but Creator pages are about people as Creators?
Some Fanfic Authors are listed under Tropers and Fanfic pages.
Move, right?