I don’t even know that much about them but I can guarantee that when I see something posted by truscum communities, I’m like “I’m not touching that with a 50 ft pole”.
It seems a lot like they focus on what is a “real” trans person, which is very toxic, unless I’m misunderstanding truscum.
Back when I was a regular lurker in such communities, they were definitely headed that way. Looking for any reason to invalidate people who didn’t fit into their vision of the cis/trans binary was the whole point. Under the guise of “we want trans people to be taken seriously, so all these different people are hurting our cause”, so much hate was spewed.
I eventually left because I realised what that toxicity was doing to my mood and outlook on life, and eventually started to reverse my stance once it was no longer constantly being reinforced by outrage, but it really is a cesspool that breeds negativity and hate.