The forum is TalkTennis, the entire board is very heavily autistic. The specific person mentioned revealed those things on messages over WhatsApp.I need links to this sort of Tennis forum perversion you are describing and I need it stat!
I think based on some of what the kid has done suggests he was molested (weirdly sexual behaviour at under 10 years old). Probably by the dad when living with him. I'm pretty sure there's a legal battle going on for something.