> The session was rejected because it relied on assumptions that run contrary to the settled science in our discipline
I don't think it's settled science. You can cross different borders on our planet and have different anthropologic organizations that come to different conclusions dependent on what borders you're inside of.
How is that not a matter for science?
It is a matter for science, but most scientists just want to do science, not engage with culture war fanatics who will literally camp outside your house and subject you and your employer to an endless internet hate campaign if you commit what they see as heresy.
The reluctance to push the topic is quite understandable when you consider how unhinged some of the people on the other side are.