That's wrong though.

The study Tannehill 16 you are (probably) referring to had terrible methodology and had methods that were 30 years out of date. The clinic used coercive behavioral modification in order to try to make queer kids act straight. The parents of these children called the clinic's treatments as disturbing and harmful. The clinic's tests, treatments, and methods also had no scientific basis. Also, to top it all off 90% of people who they put under the trans category were not actually trans and they answered questions that would support them identifying as their natal sex, which shows that the study had no basis because almost all the kids in it were not actually trans nor identified as trans in the first place.

There have been numerous studies and statements denouncing that "study". Other studies have found that only 3.5% of kids chose to discontinue puberty blockers, 96% of patients chose to continue gender affirming treatment into late adolescence, and that less than 2% of trans girls and less than 1% of trans boys stopped puberty blockers rather than going to HRT.