I don’t know of any women who have been “erased”, nor do I know many women whose femininity is so fragile, that the inclusion of trans women in the idea of what womanhood can encompass, worries or threatens them in the least. I don’t think an overwhelming majority of women are interested in gatekeeping what it means to be a woman (although men have been historically obsessed with what it means to “be a man”, so I understand why Primorac might think this.) In fact, the idea that someone else merely existing might “erase” you or threaten your place in the world is no more than you victimizing yourself. Do you know what actually erases women? Policies that take away their rights and their voices, and put their lives in danger.

As a side note, referring to women as “females”, as Primorac does here, reduces them to their reproductive abilities. This language is not an accident. That’s all that Republicans think women are good for, as evidenced by their draconian abortion policies (which actually result in more abortions; see above.) They don’t see women as people, or they’d trust them make their own choices. See: Repulicans Claim to Love Both Mothers and Children. Their Policies Prove They Love Neither.

In any case, systematically reducing women to their reproductive capabilities makes it very easy for them to discriminate against trans women – if you can’t have babies, you are not part of the club. Vice President-elect J.D. Vance routinely dismisses childless women as bad and/or useless, and even once suggested that people with children should have more voting power. 

Full contextual analysis of Section 2.6: Agency for International Development here.