First, I don't know that it's the "HN overlords". It's likely to just be HN users.

Why would they flag such a thing? Election results aren't really very much of an HN-style topic. "Yay, our side won!" is not usually a very thoughtful conversation. Nor is there anything tech-related whatsoever in the topic (aside from some somewhat-off-topic conversations about data centers).

The site guidelines say that most stories about politics are off-topic. This one fits into the "most stories" category.