I was just reading about these folks a day or two ago. This is NOT the main organization of pediatricians. It's a newish org for pediatricians that don't accept that sexual preference isn't a choice, among other things. This is the main pediatric medicine org, which goes back to 1930: https://www.aap.org/en-us/Pages/Default.aspx
As for that statement, it's BS and part of the whole "if you're different, you're wrong" ideology that leads to LGBT kids having much higher rates of suicide than others.