That's a really interesting observation. I was trying to figure out when the tenor of the comments was so hot (especially relative to the two previous times this piece has been discussed on HN), and it didn't occur to me the title may very well have played a role -- but on reading the comments here (and especially, the fixation on the number), that makes a lot of sense. Thanks for burying the thread; there was more heat than light on this one for sure!
Oh yes! - that's a whole other level to this. pg figured that out 15+ years ago*:
If the title contains a gratuitous number or number + adjective, we'd appreciate it if you'd crop it. E.g. translate "10 Ways To Do X" to "How To Do X," and "14 Amazing Ys" to "Ys." Exception: when the number is meaningful, e.g. "The 5 Platonic Solids." - https://news.ycombinator.com/newsguidelines.html
Excessive specificity has almost a hypnotic effect on the mind, and group effects compound that.
Titles are by far the biggest influence on discussion so this rule is pretty important. There are borderline cases, but I don't think this was one.