Here is where trans activists are caught in a lie, and I believe Ana the Ist has pointed this out.
The want to argue first that gender is a social construct separate from biological sex, and that while biological sex might be male or female, either could be man or woman.
Now, they want to deny that biological sex is a real thing, and that a person must not even be identified as male or female, even with no attempt to categorize them as man or woman.