@adversary
First of all let me say this has been interesting to read, and this misuse of the term "biological essentialism" that you describe seems rather concerning.
However, I don't understand your argument that *every* project that uses the ConCov is automatically hostile to intersex people.
There seem to be quite a few projects that have picked the ConCov just because other projects use it and the text itself seems okay, without any considerations regarding its history being a factor.
I would think each such project makes its own choices in how to interpret the document, and many would choose an intersex-friendly interpretation. If intersex people raise concerns I would think such a project would usually choose to just add intersex to the protected categories of people, rather than go with this very strange abuse of the term "biological essentialism".
Or at least, I would hope so.