Just asking questions, here, but if, hypothetically he actually did do it, and they did tell him, do you think he have been honest with you about it?
It's entirely possible that everyone involved knows what's going on, and he's just trying to save face. People do that sometimes, after they misbehave.
Nope. I had that happen to me at least twice. If you get accused of something unwoke then the accusers identities are always protected, and if the accusation is proven to be false, nothing ever happens. It's a part of how the woke take over institutions.
Oh, it's a still thing, it usually happens when you submit a complaint against your boss to HR, are assured that it will be confidential, and next thing you know, your boss is retaliating against you, because of course the first thing HR does is to go to him, and the first thing he does is to hit you back.
Happens all the time, FAANG firms are constantly getting in trouble for it.
One difference between a courtroom and a workroom, is that a boss can often ruin his accuser's life in the latter. The justice system works because it treats all people as equal. In the workplace, you are not the equal of your manager.
Fortunately, you can always escalate your complaint into a courtroom. Unfortunately, proving retaliation is next to impossible.
It's entirely possible that everyone involved knows what's going on, and he's just trying to save face. People do that sometimes, after they misbehave.