Sure that's possible, however, four things: 1) There's not nearly enough information to determine that from the post, 2) the post actually says evidence was collected, which may suggest the person was caretaking justice, 3) in any case, that would be legal advice, which, however constructive, the person has plenty of and 4) if you believe this, and you don't do anything to report that, does that make you culpable of the very thing you're wondering someone else did?
It's interesting to consider, and I don't know. I'm not a legal professional tho I imagine a legal professional would say "there's not enough information."
So on those points alone I feel it's far more likely what you suggest is incorrect. Also I'm inclined to believe that. One reason is it works to choose the benefit of the doubt (not only because it's a legal doctrine), one reason for that being the benefit of the doubt creates harmony amongst people. Search for the good, sometimes it takes effort, and it's worth it. You'll be happier, definitely, if you see the good. On that point, I'd say we're wired to imaginatively perceive the bad, because we're wired for "threat landscape analysis". Tho this disturbs the mind, and maybe isn't always a clarity that works for people. Seeing the good is more unnatural and yet I think also very valuable.
Finally, if a person is asking strangers for advice at a pivotal moment, I'd say they're valuing and respecting others. It also works to respect their vulnerability in reaching out and help. I mean, that's the putative spirit of "Ask HN", right?
Maybe I'm missing something here, and benefit of the doubt goes a long way it seems to me. I'm also finding the HN Guideline, "Don't say anything you wouldn't say to someone's face" really useful in guiding choice on what to say here! :)