You can read Singal's response to these criticisms here: https://jessesingal.substack.com/p/a-sorta-quick-response-to...

The criticisms of Singal's piece are pretty weak, and often resort to refuting things he never actually wrote. He explicitly notes that data is sparse - this is one of the most controversial research subjects - but it does indeed suggest a desistance rate of 50-60% absent medical intervention. Contrast that with the common claim that desistance in gender dysphoric children is a myth which is just totally contradicted by the available evidence.