Inclusivity means everyone.
No it doesn't.
If inclusivity meant everyone, every group/body/organisation/society/association would have to be open to the entire human race.
The word 'inclusive' is from the same root as 'enclose' - to enclose is to put a barrier around something to keep the inside in and the outside out, so to speak,
A sheep enclosure is to keep the sheep in, and, ideally, the wolves out.
So for a group to be 'inclusive', it must include everybody who belongs to the category included in that group. But it does not have to include everybody, that would be silly.
So I'm not going to cry havoc and let loose the dogs of discrimination law if I can't join a support group specifically for people who are left-handed, or for people who own Maseratis.
They are inclusive as long as they welcome all left-handed people, and all Maserati owners.
Your definition of inclusivity would mean that I could insist on membership, despite being right-handed and not even liking Maseratis - too showy😏
So a group that is designated as being for all women - and the Supreme Court has made it clear what 'woman' means - only has to be open to all women to be inclusive.
If it was also open to men, it would not be an inclusive women's group, it would just be a inclusive human being group, and there are plenty of thriving, lively, human being groups out there to join and enjoy