Parenthood doesn't imply fertility. From that link:

> Trans parents may form their families in a range of ways, including through biological parenthood, step-parenthood, adoption, fostering, and assisted reproduction, with an increasing number of options available to trans people wishing to become parents.

So what? Human societies have always and everywhere included multiple modes of parenthood. I don't understand this obsession with personal biological reproduction. That's not how human societies work. Adoption, fostering, etc are an important part of social sustainability and always have been.

The original assertion was about fertility:

> Trans hormones don’t necessarily cause permanent sterilization. Plenty of trans people have children

I was just pointing out that the evidence provided with the 25% number doesn't really speak to fertility, but rather all the possible ways of having children.

That was much higher than I had expected.

Me too, but I suppose being trans doesn't eliminate all the other aspects of human behaviour and psychology, including the desire to have or care for children.