I don't think trannies lost the culture war, it's the troons that lost the culture war and let me explain. Like a lot of communities, no community is truly a monolith where everyone thinks the same.
A lot of troons like Keffals promoted stupid shit like HRT for minors and gender reassignment surgery for minors while completely ignoring how these near-permanent solutions to the human body can do a lot of damage to kids mentally.
Now there's a bill in Congress that just cleared the House that will make it illegal to troon out kids; the mentally ill troons are angry at this and it isn't because of human rights concerns for LGBT youth but because making it illegal to troon out kids would drastically reduce the number of troons at least in America (troons cannot reproduce naturally so they have to force their lifestyle on kids in order to start the next generation of troons).
For very obvious reasons, you do have trannies that don't agree with trooning out kids. You have people like Blaire White where Blaire objects to giving kids access to HRT and gender reassignment surgery because impressionable kids shouldn't be subjected to the things adults have access to. Obviously people like Blaire White are in the minority and the trans voices that object to trooning out kids are outnumbered by the trannies that want to troon out kids.
Part of the reason why the LGBT community is losing the culture war is mostly because of the troons that keep making the rest of the LGBT community look bad with their nonsense. Transpeople didn't lost the culture war, the trannies will always be here even when they enact laws that forbid doctors and activists groups to troon out kids. The troons lost the culture war because it's very difficult to convience a raitonal person why chopping off a kid's genitals will somehow make Western society more equal.