Doesn't that broadly seem like a problem? Given the preferred pronouns here are "they/them", which is what people ought to be using if they don't know, the problem stems from people inherently assuming "he/him" for any technical work. That's a problem beyond just trans/gnc issues.
Given that for non-city dwellers, interactions with transgenders are rarer than rare. Given that the assumption that anything non explicitly female is male is still very common. I suspect foone will be dealing with this issue for longer than they’d like.