Hmmm...
If it was physical abuse by an adult against a junior player (more so u16 than u18)…
It would be up to any mandated notifier to contact the child protective services of that state.
Then there would be an investigation and the perpetrator could be removed from any role in junior sport. Coaches should do training in mandatory notification these days.
The first thing that the child protective services investigator would look for is evidence to corroborate or dispute the claim of abuse.
I'm a teacher by trade. I once had a kid referred to me in my specialist role, after he was bashed in the front office by his father. The Principal stated that the police had attended and said they would put in a report. I asked her if she had reported it as well. She said she was leaving it up to the attending police. I suggested strongly that DoCS would look for a report from the school through the Ed Dept, and if thee wasn’t one she could expect a phone call asking for an explanation.
IFF the person posting this was legitimate, DO NOT INVESTIGATE IN ANY WAY. Just make the call, and be prepared to make a written report and be interviewed.