See, I can boil down all this socialist BS into a much more simple description accurate to the situation:
Women who want women to keep having babies and are old school feminists do not support telling men that they can be women, or women that they can be men, if they get surgeries and hormones.
TERFs, or what ever you call them, are at least sane enough to know their are only two biological sexes.
The ironic thing is that during the era when feminists were actually in support of natal policies, transsexuality was a non-issue to the matter of feminism. And of course the reason for that is that we were not infested with cultural Marxism, and the entire concept of "transgender" did not exist yet.
From an axiomatic definition, they are indeed only two biological sexes, plus a failed or neuter category. However, since an XY female can grow up to have normal, healthy, XY female children, we know as a point of objective fact that you cannot axiomatically define sex based on chromosomes. They're simply not good enough; XY can produce a biological female. It is extremely rare, but that's sufficient to dismiss an axiomatic argument of male/female classification from chromosomes alone.
So what does allow us to make that definition in biological terms? Primary sexual characteristics, of course, which means functional sex organs. But a postoperative transsexual lacks these; therefore, they cannot be placed in either the male or female category. They are now in the failed or neutral category. At that point, their secondary sexual characteristics are entirely female (or for FTM, male), and their social behaviour and classification (assuming the case of true transsexuals) is recognizably fully female (or for the FTM, male). Since the secondary sexual characteristics and social role and behaviour match correctly with the identified sex, it's quite sufficient to combine that with a neuter classification on primary sex characteristics and call a MTF a woman, and a FTM a man. Indeed, this is the conservative approach which successfully eliminates any kind of social disruption, and by the preponderance of the evidence and a lack of an axiomatic definition to the contrary, allows someone to be perfectly truthful.
Of course, this is all poison to the transgenderists, because it requires them to actually get surgery, to actually attempt to pass in their identified sex instead of being "radical", and to treat social acceptance as a goal to be achieved at all costs. But that is all a fair and reasonable set of requirements, and one that separates "transing" ideological pro-trans radfems-the transgenderist ideology--from people with a sincere medical and spiritual condition.