Personally I believe it was intentional. Many of the users in r/detrans are critical of the transitioning process, beliefs surrounding transgender identity, medical and legal handing of gender dysphoria, and the general treatment of desisters and detransitioners by trans activists and their allies. Even the detransitioners there who believe transition may work for some people but not all get branded as anti-trans by outside viewers. Recent banwaves affected subreddits that were seen as "hateful" so I'm surprised Reddit reversed the ban of r/detrans.

Detransitioners' voices and concerns are tossed into the wind because they go against the popular narrative at the moment that affirmation is the only model and anything else will end up in dead bodies. The detransition phenomenon "invalidates" other people's experiences about transitioning. I have seen people that stopped identifying as trans get abandoned by trans friends, get turned on as if their very existence is somehow a threat in and of itself. There are some very ugly underbellies to the trans community and movement that is only starting to enter mainstream consciousness because detrans folks have long been censored, intimidated, and guilted into silence.

A r/detrans user commented something to the effect of "there is no it gets better message for dysphoric people, you either transition or end up killing yourself" and I felt that. There need to be more alternatives to treating gender dysphoria.