It's not flagged, it just went from #13 on the front page to invisible. In a single refresh. How does that work? Looking at the votes and age, it should be in the top 5 of both Ask and the front page. What's the metric or decision that made it disappear?
@dang might be worth commenting on this? Moderation is fine, opaque removal of content with no explanation, not so much. I fully believe @dang has the best interests of the community in mind, so please give us a clear explanation of what's going on here.