So it's a construct? Women don't have to be female, and it comes down to what people want to be called? If that's the case, women don't really exist (other than in a hypothetical sense), but we all know that's not true.
'People who present in a certain way usually attributed to females'. Isn't 'presentation' a conscious choice? That suggests that anyone can be a woman, in the way that anyone can be a hippy, or a mod, or a goth. There is surely more to it than that? As a woman, I know that there is more to it than that. Don't you?
I don't think that transwomen are an obsession. It's just that they are men who are likely to find themselves in women's spaces (the 'real' ones, that is - GagaJo's 'fake' ones will inveigle their way in), who are, on average, bigger and stronger than the average woman, and who are therefore much more able to cause damage to a woman than the average transwoman is to the average man.
I'm still wondering which of your earlier statements is untrue, incidentally - it's taking you a long time to decide.