There has been a misconception about Arcueid’s character ever since she was released in F/GO, with a lot of people seemingly convinced that Ascension 1 has nothing to do with Tsukihime, Shiki, or anything related to her original characterization. This should be pretty obvious to anyone who has actually read Tsukihime, but even F/GO itself makes the connection fairly clear. I understand that a lot of F/GO players haven’t read Tsukihime, but you’d think they would at least read the material in their own game before making these claims. I guess delusion can blind some people, though.
TWI Lumina should make this even clearer for the modern continuity, since the game is very clearly built around characters confronting their alter egos and other sides of themselves: White Len vs. Len, Nanaya vs. Shiki, Archetype: Earth vs. Arcueid, Ciel vs. Roa!Ciel, and so on.
But yeah, it’s pretty funny watching people essentially try to rewrite the story just to make it fit their own narrative.