Okay, I'm trying to piece the story together.
So, there was a post linking to more secure and decentralised platforms for trans people to use following the US election.
I'm not entirely sure which part of it is the extremist pipeline. Did you specifically mean hexbear? I heard some bad stuff about it so yeah idk
Hexbear is a very toxic instance with mods that allow their users to harass others. Both hexbear and .ml are filled with tankie users and mods, which is another reason to avoid those places
Hexbear is another instance that's just full of tankies and terminally online idiots. Most other instances have them banned because all they do is cause trouble
I actually saw these comments before they were deleted.
It was a post listing a bunch of resources for trans people to use to digital protect themselves in light of the election. One example is it suggested Matrix instead of Discord.
On the list it included a couple trans-friendly Lemmy instances. IIRC the 3 instances listed were from blahaj.zone, lemmy.ml, and hexbear. A couple people commented that they liked the idea but didn’t like the inclusion of hexbear.
The mod also listed their own inactive community rather than the actually active trans communities for whatever reason. It's not a very good list of online spaces whatsoever