> "Is reddit a good "detective"?"

How is that relevant to this discussion? That reddit is correct in this particular instance isn't in question. Unless you're entertaining the notion of devious redditors hacking youtube to fabricate the original video.. Responding to this circumstance by calling into question the reputation of reddit seems like textbook FUD. There is no legitimate defensible uncertainty or doubt here, no matter reddit's reputation.

War propaganda, i.e., information warfare, is absolutely relevant to HN & it's readers.

Those guidelines are fairly subjective when it comes to something like this. They don't say "most stories about politics..." rather than "all stories about politics..." for a reason. I think you could effectively argue either that this is on-topic or off-topic...

That said, then why not err on the side of leaving this up? I like HN because there are usually insightful, level-headed discussions about a wide variety of topics. This is definitely one I'd love to read a larger take on from the HN crowd on. This isn't a status quo I'd like to see more people accept.