https://healthcare.utah.edu/healthfeed/2024/09/uneven-playin...

“Women tend to have thinner skulls than men, along with smaller neck muscles, which can predispose female athletes to getting a concussion,” says Sarah Menacho, MD, a neurosurgeon and neurocritical care specialist at University of Utah Health. “Data shows that women are also more likely than men to report concussion-related symptoms, and these symptoms can persist for a longer time period prior to recovery than in male athletes.”

Yes. It's not a matter of belief, sex differences in concussion risk have been extensively studied.

https://www.scientificamerican.com/article/why-sports-concus...