I get your point, and for the record, I don't consider the working group the PC brigade or anything like it. But I see statements similar to this in a lot:
https://www.theravive.com/therapedia/gender-dysphoria-dsm--5-302.85-(f64.9)
There is often reference to two pressures being considered beyond the accurate classification of a phenomenon. This first, referenced above, is a desire to remove the stigma of mental illness. The second, which goes in a sort of opposite direction, is a pressure to keep a diagnosis of some sort of issue for which treatment is needed. This is to avoid treatments like SRS from being classified as unnecessary or cosmetic in nature. Otherwise health services or insurance may not cover the procedures.
So yes, the working group did consider social forces outside of strictly psychology in their classifications. Personally, I don't have a problem with that. But, as someone who works in the sciences, I have to say that the idea that science is insulated from the political climate is a bit naive. (I'm not going to expand on that, though, as it would involve dragging in the private opinions and experiences of some colleagues without their permission. Also it's a bit of a derail.)