Memoryholing the four years of the Biden administration.

No, not really. The "groomer" panic took place during the Biden years, with plenty of states passing anti-trans legislation and banning pro-trans books from libraries. The Biden administration did not reverse the widespread cultural hatred, discrimination and violence against trans people in the US in any meaningful sense. And it's honestly weird that you would think it even could have, given where we are now politically.

It’s two different cultures, one of which is more dominant, or was during the Biden years. As always, only the dominant culture matters culturally.

The premise that during the Biden years transgender culture was the dominant culture in America is just plainly ridiculous, as is the implication that only transgender identity mattered, culturally, during those years. Again, these were the years when transphobia began to mainstream and become codified into legislation and "antiwoke" and "anti-DEI" culture. It was never dominant, it only just started to become visible enough to really piss people off (similar to gay culture in the 1980s.)

Not transgender culture but elite coastal liberal culture.

What would you call the political culture that has replaced it?

I wouldn’t say anything has replaced it yet, more that the Trump admin is trying to do so currently by removing a lot of programs, banning words, purging employees, etc. Whether that will be successful remains to be seen but coastal liberal culture is very dominant and I don’t see it being replaced any time soon. And I guess you could call the other culture conservative culture.

Probably correctly termed "counter-revolutionary", given the self-used terminology of its proponents. [0]

Historically ironic, given MAGA's ideological birth in the Tea Party movement.

[0] https://americanmind.org/salvo/trumps-smithsonian-counter-re...

I would argue MAGA is somewhat revolutionary from the neoliberal globalist two party consensus in the last 30-40 years. Coastal liberal culture and its components might see itself as revolutionary, woke and so on, but I see it as just a continuation of liberal culture. After all, wokism, or whatever the term is, very comfortably fits in elite coastal liberal culture and that culture has been dominant for decades.