a) "Vast majority" is what we seem to be arguing about here, eg when you tot up all the LGBTIQ+ people, they are not "zero" (as some try to claim) nor "chosing to do it" (ditto) nor sub-human (ditto) nor dangerous perverts (ditto, eg in that Bill).
b) And even if only 0.00000001% of people were not absolutely in a convenient binary category or the other, would that be a good reason to treat those few as political point-scoring opportunities, deny they exist, or discriminate against them?
I suppose that when large chunks of a population still see out and out racism and sexism as somehow acceptable, for example, picking on other minorities for personal gain doesn't seem so weird.
So fighting over the details of definition and number of intersex is rather to miss the point that is most definitely real and very much non-zero, and people in power refuse to act on that information humanely.