Sexual Differences in Concussion Damage

Kind of stunned that these researchers are allowed to talk about differences between men and women:

Important brain structures that are key for signaling in the brain are narrower and less dense in females, and more likely to be damaged by brain injuries, such as concussion. . . . The structural differences in male and female brains might explain why females are more prone to concussions and experience longer recovery from the injury than their male counterparts…

So there are significant differences between male and female brains (duh, we’ve known that for a century).

Doesn’t this imply that without brain surgery, trans folk can’t claim to have fully transitioned?