Dimentoplus based on the timestamps, she stopped once she found out he was under aged (except for that one chat where she asks if he's legal yet), she's banned, going to actual authorities would be a waste of time as nothing would come from it imo.
I feel like you'd need to be intentionally ignorant of the community you're part of (and the person you're speaking with) to not know when you're talking to a kid. Also, they admitted they knew somebody was underage and tried to influence them anyways.
They're on some abhorrent shit and are lucky that there's very little offline accountability for it.