Unfortunately, I can confirm your husband’s theory is incorrect. My ex is trans. I didn’t know it when we got together when I was 17. We had a terrible on/off relationship. We lived together twice. 3 years into our relationship, he finally told me he wanted to be a female. I thought knowing this information would be helpful in our relationship. It wasn’t. We moved a thousand miles from our families and tried to live together the second time. Relationship was still bad and we broke up for the last time. Then I met a dude who is now my husband, and we have 4 kids and live in Texas. My ex went back to Illinois and started taking hormones. I definitely got the better deal.

TL;DR version: maybe it’s possible, but definitely not all.