For most of history, the whole point of feminism was to oppse sex-based segregation and restrictions that were imposed by patriarchal society.
So I don't see how supporting strict gender categories, and simply calling them "sex-based" instead, in any way leans itself to "gender abolition".
One might get impression that "gender" is simply being used to mean trans people existing, and "gender abolition" simply means restricting trans people from being able to transition and use different gender labels. And basically nothing else.
With "sex-based rules and restrictions" being basically just gender roles but trans-proofed.