I see things like this advertised in writing circles all the time. It is thoroughly depressing and I am glad that it is being questioned.
I don't, and I'm in a lot of writing circles. The topic of transgenderism has never once been mentioned by any writer I know. I do know a few quite prominent writers on Facebook who are all gendercritical.
But I used to belong to a very large American writer's forum and that is actually the place where I first heard the terms cis and genderqueer and non-binary as it was an extremely woke group. I always knew I didn't belong there and I always loathed the word cis but what to do? I was the only one, apparently, who didn't toe the line.
Some of these are women who write porn. They are extremely hard-line woke and eventually I left the group. I do notice a difference between Americans and English writers. The latter, at least he ones I know, are far more GC.