I don't think that's a proper use of flagging:

> What does [flagged] mean?

> It means that users flagged a post as breaking the guidelines or otherwise not belonging on Hacker News.

You could contrive that this breaks the "don't editorialize titles" guidelines, in the lack of a better option.

I actually unflag after corrections. I think one-off flagging doesn't end up triggering any badness for the poster (and the rules for comments vs posts are different). Only once enough people flag something does anything happen.

Your reputation as a flagger goes down when you make a lot of false-flags (I don't know exactly how this is measured). I.e. your flags start counting for less

It means that N people worth X points more than you flagged it in a short span of time, so the site hides it unless someone vouches for you.

Unless you have "show dead" turned on, in which case you see it anyway. (You still can't comment on it, though.)

And, if it's dead and you see it and you don't think it should be dead, you can "vouch" for it. If enough people do that, it can lift the "flagged" status.

if you want a mod to fix something, emailing them is more reliable. I don't think flagging is fair over non-intentional title manipulation.