...please use the original title, unless it is misleading or linkbait; don't editorialize
It's just the HN guidelines are clear that you're meant to use the original title unless it's clickbait or misleading. It's been part of the guidelines for at least as long as the guidelines have existed in their current form (over 5 years):
https://web.archive.org/web/20140702092610/https://news.ycom...
There's a very good reason for this: when people construct their own title to highlight some aspect or angle they think is important, they often get it wrong and imply something about the article that isn't actually reflected in the content - much like clickbait headlines themselves often do.
I'm not commenting on whether or not you did that, but there's a simple way to ensure you don't make that mistake: just use the original title!