Having some brain measurements that are more similar to the opposite sex correlates with homosexuality, not trans.
The initial studies on this didn't control for sexuality and mostly used subjects who were both homosexual and transsexual. In later studies that also measured sexuality, no correlation of sex atypical brain measurements with trans was found, only with homosexuality.
Could you link to these studies, please? I made a quick Google search and I found quite the opposite, two studies from 2021 and 2022 supporting brain differences on trans people from their biological sex brain. I find quite hard to believe that correlation between sexual attraction and brain structures.
The initial studies on this didn't control for sexuality and mostly used subjects who were both homosexual and transsexual. In later studies that also measured sexuality, no correlation of sex atypical brain measurements with trans was found, only with homosexuality.