Meta-examination of all studies done to discover difference in male and female brains have not detected ANY difference that would allow a researcher to definitely say one brain is male and the other is female.
That's true but it's not the whole story. The best comparison that I can come up with is hight, there are no male or female hights, although men tend to be taller than women but I can't shout out 6'1" and expect you to know, definitively, that I'm talking about a man. So while I can't claim that there are specific brain differences that are unique and ubiquitous to either sex or gender, I can say that male brains tend in one direction and women's brains tend in another.
The same is true of most gendered things, I can think of nothing that I can say is absolutely common to all women, we find outliers and exceptions everywhere.
Here's a report of a study that has a larger than normal sample size, showing physical brains differences. It also touches to how hormones might impact brains function, in relation to menopausal women:
www.sciencemag.org/news/2017/04/study-finds-some-significant-differences-brains-men-and-women
Extraordinary claims require extraordinary proof. All anyone making claims about innate gender has been able to offer up is either or sophistry. Women have every reason on earth to push back against this assertion of gendered brains, because we KNOW it will be used against us.
I keep not claiming that I have any proof that gender is innate. What I keep saying this that there is no proof that all gendered behaviour is a result of outside influence ie that gender is a social construct. Saying that something isn't black, doesn't means that I'm claiming it's white.
I can't see why gendered brains are more intrinsically oppress-able than sexed brains or brains that have adapted to cultural constraints.