From memory, he was saying that people who go through some kind of trans affirmative procedures have a dissatisfaction rate of 5% and this is likely to be lower than the complication rate.

I think I watched the first hour, here's the video: https://youtu.be/qGuvDlYDNzU, I'm sure if you're inclined to be critical of trans healthcare then it would be possible to make counter arguments to things that he says.

My perspective is; There seems to be concrete evidence from neuroimaging studies that transgender people's neuroanatomy more clearly matches the identified gender than the chromosomal gender. This is corroborated by anthropological and epidemiological evidence.

Clearly it's a complex issue and I think it could be quite possible to put cisgender people whose sense of gender was badly traumatised on hormone therapy as a teenager and cause them problems later in life. However 40% suicide rate in trans people is not something to be ignored