If this were true Trump wouldn't be able to shut up about it. He'd spin it the same way Johnson did, that he "heard a rumor" and notified the FBI. But all of Trump's behavior is about trying to suppress interest in the case, so there's something very bad in there for him and it's not money laundering. His base doesn't give a shit about money laundering.
So either he actually did notify the FBI but there's also direct evidence he participated in rape of underage girls and was somehow granted immunity, or this is just yet another trial balloon by his supporters to try to present him as some kind of avenging hero.
My bet is the latter.
As a reminder, Melinda Gates left Bill in large part because of his close association with Jeffrey Epstein, as well as his long-time affair with a Russian bridge player in her 20s.