Since the submitter was attempting to use representative language from the article, I figure they thought the original title was baity and were trying to follow the guidelines by changing it.
You could literally change the title to "An article about something" and it would be an equally "good" title.
I wouldn't want every, or even any other title to be as vague as "Well, Duh". But one is ok. It's generally good for HN's front page to have a couple that don't give their secrets away. We don't want to spell everything out. It's good for readers to have to work a little.
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
If all information on the front page is obvious and straightforward, that's like simple carbohydrates—so quickly metabolized that they turn into sugar-rush discussion in which people react quickly out of reflexive associations. It's good to have some fiber to slow that mechanism down.
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...