Recently, when a single person vehemently objects to a post, it disappears off the front page.
Liken a submission to Reddit, or call it over-hyped, and it's a goner.
I've noticed this trend recently, and it just happened with one of my submissions:
https://news.ycombinator.com/item?id=5684770
Or do votes not count any more?
(I have a feeling this may mysteriously disappear)
It doesn't take many flags from ordinary users to get an item off the front page. Flags carry a heavy penalty, and it seems that just three or four will take an item a long way down the rankings. If one person points out that they think an item is inappropriate, or isn't really of "deep interest" to the hacker culture/mentality, others will stop to wonder, and then they may also flag. Thus a single comment like that will often result in enough flags to take the item down quickly.
I've found a good predictor is the ratio of points to comments. The item you mention has 23 points but 42 comments. People are replying without upvoting, and that is a predictor of something that many will think is not really contributing value to the site as a whole. Correlation is not causation, etc, etc, but I've found it to be a good predictor of what I personally want to read.
So those are my thoughts - they're probably worth about as much as you paid for them.