alt Hacker NewsThe "increase" could just be that (1) we've evolved enough acceptance for people to come out of the closet and (2) lots of people have adopted neutral pronouns on social media as a way of showing support for the issue, not due to actual gender dysphoria. If you're trying to scare people, all of these people are now "trans".
Just like people are easy to scare about autism being some kind of epidemic when many people (like me) have a diagnosis of only a mild, borderline, or provisional form of it. That never would have been diagnosed until recently or would have been diagnosed as something else.
The "increase" is certainly in large part exactly that. However it might not be the only reason.
Autism frequency is increasing, and this is due in large part due to awareness, better diagnostic tools, awareness that autism happens in girls, etc, but it does not seem to account for all of the increase.