Let's unpack why;
I think this part is important, before anyone coughROWLINGcough claims this is a large phenomenon:Research by Stonewall showed that of the 3,398 transgender patients who had appointments at an NHS Gender Identity Service between 2016 and 2017, less than 1% said they had experienced regret after transitioning or had detransitioned.
"I don't think we should make any special accomodation for what amounts to only about 1% of the group" says trans activist without a hint of irony or self awareness
Not that I disagree with your general sentiment but to be fair the bit you quoted doesn't mention special accomodation unless I'm missing something. I don't think it's dishonest to point that detransitioning is AFAIK a fairly minor phenomenon to put it in proper context and perspective.
I don't see the relevance in bringing up the proportion of people affected, outside of of an attempt to 'downplay' the issue because taking additional steps to minimise harm makes things slightly more inconvenient for the larger group.
Like, if the discussion was about preventable deaths in traffic accidents, saying "oh, but only 1% of car crashes at low speeds are fatal" when discussing, say, making seatbelts mandatory is true, but also irrelevant to the underlying issue being what can society do to prevent unnecessary fatalities in traffic accidents when there are steps that can be taken to bring that percentage down to near zero.
When we're talking about elective medical procedures, a rate of 1% of people being harmed by a procedure that was not done under duress in an emergency scenario
absolutely should involve a conversation about how to avoid a needless harm, even if that discussion is awfully inconvenient to a particular ideology to have.