It stopped being centered around gender dysphoria quite a while ago. Gender identity is where it's at now, and the idea that one does not need to be dysphoric to be trans is currently the most mainstream one.

What we call gender dysphoria is really just a cluster of symptoms around people's sense of their identity.

But identity as a whole is a very murky thing - if you ask me it's largely an adaptive abstraction that our minds invent.

The purpose of said adaption is to adopt a role which functions within the tribe/society for purposes of survival.

I think we way over-simplify the whole thing by making it about gender and gender roles.

And it's that over-simplification that I would label as the ideology. Because that's what ideologies do: they take the complex ambiguities of the world and try to cram them into a simplistic box.