'Regret Rate' isn't zero...it's extremely low. What isn't low is the rate of suicides for those with Gender Identification problems vs the general population. Sadly, there are people who still think 'Conversion Therapy' will "Cure" Homosexuality.
btw, the attached paper references studies of 7,928 gender-affirming surgeries to reach their conclusion. Do Critical Thinking research before posting.
Link: https://theconversation.com/transgender-regret-research-challenges-narratives-about-gender-affirming-surgeries-220642