the problem with Seven's deadnaming (whether on the shows, or the novels, or in fic) is that it definitely IS deadnaming because it's not her name, she canonically, on two different shows, hates being called anything other than Seven or Seven of Nine, and at worst she says nothing about it if she has no recourse. The unfortunate fact of the matter though is that literally everyone knows about “Annika Hansen” because it was on the file related to her and her parents' disappearence, and it could've been interesting commentary on how having been part of the news/having publications/being credited for their work publicly makes it difficult for a lot of trans people to escape being outed and/or deadnamed. And yet the shows still keep being weirdly ambiguous about what Seven's deadname represents! We got Janeway trying to 'appeal to her humanity' by deadnaming her, Axum being grumpy that the person she is now is not the dream projection of a little girl anymore (more deadnaming), a Borg cube deadnaming her in front of Elnor (??), and an asshole who clung so hard to his status as veteran of Wolf 359 that he couldn't help but deadname his own first officer at every turn. It's like, I'm not surprised to learn that fic writers are unrepentant when doing the same thing to Seven because canon is weirdly fond of this crap as well!