No, it was scanning for keywords over a 12 month time period from a convenience sample
WP of patients who kept coming back. It was
not tracking a representative set of GIDS patients over a significant amount of time to see whether they decided to stop transitioning, socially and/or medically.
"The reports that were retrieved in the search were reviewed by study authors to identify evidence that patients had detransitioned or expressed regret related to their transition."
Stopping a transition is not detransitioning in all cases.
The 'convenience sample' were 3398 patients in the national UK Gender Identity Clinic. As they're measuring how often that happens for that center, that seems like a right proper sample.
To find out what the actual rate of desisting and/or detranistioning really is, we'd need a longitudinal study on a representative sample of individuals who began the process of transition years many ago.
Oh of course that would be better but...
"Study findings are consistent with previous research showing low rates of detransition."
Also,
"Of these 16 (where the rate came from) one patient expressed regret but was not considering detransitioning, two had expressed regret and were considering detransitioning, three had detransitioned, and ten had detransitioned temporarily."
So of the 16 out of 3398 who they found had regret or detransitioned in the year, three actually detransitioned. Maybe some of the ten who did so temporarily will stay detransitioned or the two who were considering it would actually do so, but that's not a great rate.
And also, "The reasons stated by patients for their regret or detransition included: social factors, reporting physical complications, and changing their mind about their gender identity and identifying as their gender assigned at birth."
See that the first factor listed is something that people in this thread have more control over than the clinic does.
Pretty good evidence overall that this clinic is doing a good job of vetting people.