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They could also have added this to the headline to make it more informative.

The news site yes. Otherwise HN rules are you have to add the exact article title to your submission, only exception is if it is too long.

> Otherwise please use the original title, unless it is misleading or linkbait; don't editorialize.

https://news.ycombinator.com/newsguidelines.html

I think a case can be made for it being slightly misleading. Also there is not mention of title length that I can see.

Length is enforced when submitting; titles that are too long generate a message about how many characters they are too long by and the [Submit] button is invalidated until shortened.

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