My understanding is that is not quite true. While a Trans women's brain may have a thicker cortex which is more common among females the extra volume is not in the same areas as is common in females, and more to my original point my understanding is these comparison were between trans identifying individuals and heterosexual brain scans, would we see the same differences when compared to a homosexual brain scan? The brain stuff is very interesting, but I do not think it is as conclusive as activists on either side of this issue want it to be.