You mean this quote:
>June 2018: There was a TL discussion about gender-neutral pronouns and then "preferred pronouns". (I know they're not "preferred", but this was the phrasing used by the people bringing it up.) Some moderators who are not native English speakers expressed confusion. I said I avoid singular they for that reason, 95% of the time you can write around the problem, and (on SE) I'm offended when someone edits my posts badly to solve a gender-neutrality problem. (Editing well is fine, which usually means pluralizing or using a name or something like that instead of either generic "he" or singular "they".) Some people said not using preferred pronouns invalidates the person; I said for me it's not about the person at all but the quality of my own writing (an important part of my identity). Tension rose, other people said some things I saw as bullying, and I stepped out. For a long time after, I didn't enter the room unless strictly necessary. Note: no employee said anything to me about my role in this conversation, and while some other mods disagreed with my position, none said anything like "this is a Code of Conduct (CoC) violation". Employees witnessed this discussion.
I don't see anything in there that would apply to fictional characters (Alice and Bob). It all seems to be only about real people. Also I don't see anything in there that indicates Stack Exchange says you can't refer to Alice as "she", unless Alice specifically wants to be called by some other pronoun.