[makeworld]

As I mentioned in another comment:

Abigail Shrier is a writer and not a scientist, and it can be clearly seen even from the title of the book that she has an agenda. The thesis of the book has been "rejected by the American Psychiatric Association, the American Academy of Pediatrics, the Endocrine Society, the American Academy of Child and Adolescent Psychiatry, and the World Professional Association for Transgender Health."

https://en.wikipedia.org/wiki/Irreversible_Damage

If you have a peer-reviewed study, that would be much more worthwhile to look at.

[honkdaddy]

As I mentioned in another comment, multiple studies have been done. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6095578/

[makeworld]

That study has issues, does it not? https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6424477/

Interviewing parents seems like a problematic basis for an entirely new condition to me.

[chitowneats]

There is severe hesitation to fund this research by the psychiatric and medical establishment.