Sorry to hear about an unpleasant situation. However, I think it's safe to assume this is unrelated to the story about the dude's password and HR issues.
Well it's none of my business and after the story you've shared I can't say I am very concerned. But in the story about HR, they looked into it and there was "other stuff", I guess they concluded something else about that situation.
We don't know what that "other stuff" is and if it's right or wrong, but it's also likely not the exact same situation as your very detailed and specific story, is my point.
There's at least another similarity, and that's that neither of us had been accused of misconduct in our workplace. If anything, he was looking sharp relative to my vindictive smear campaign.