When is that video from? The studies he mentions, of BSTc and INAH-3 nuclei, are from way back in 1990s and early 2000s, and there has been much research since which disputes the stance he's taken in this video. Specifically, when researchers controlled for sexual orientation, there was no cross-sex shift in brain structures that correlated with transsexuality.

> there has been much research since which disputes the stance he's taken in this video.

Has there? Following studies have shown more differentiation than in the earlier studies. Reviews of the data resulted in some additional commonalities, accoring to: https://en.wikipedia.org/wiki/Causes_of_gender_incongruence

Which research are you referring to?

This for example: https://pubmed.ncbi.nlm.nih.gov/21467211/