It’s an attempt to strip women of their history.
Women have fought in pretty much every conflict, ever. Sometimes on the front lines (Kurdish women fighting ISIS); as resistance fighters; disguised as men or as war leaders in their own right.
The German Night Witches were an all-female aviation bomber unit - and that’s within living memory.
When push comes to shove, women throughout history have taken up arms, voluntarily or because they had no choice.
But if you deny that archeology can tell a woman’s skeleton from a man’s, by transing the skeleton, you support the agenda that biology isn’t real.
By denying the possibility of female warriors, suggesting that the only possibilities are trans or “gender fluidity”, you deny both the richness of women’s history and their agency, even repressive cultures. You also deny the richness and strangeness of history itself, by suggesting that all times and cultures must reflect only what you believe now, in this minute.
And you deny women as fully human, capable of the full range of human emotion; including rage, violence and aggression.
I’m not sure why you’d doubt that in a culture based on raiding and battle, there would be women able and willing to be warriors. It would seem more sensible than not, to be able to defend yourself, your children and your home.