Just because there is no evidence doesn't mean that it should be ignored. Lots of things don't yet have evidence but it is still worth letting people know so that they are ready to take the appropriate action when the time comes.

Let's face it. Lots of posts on HN are pure speculation but they don't get buried. In this case, leaving it up won't do any harm? If it's not real, then no problem. You may have convinced a few people that they should change their passwords though, but that is a good thing. If it is real, then people will already have changed their passwords. It is win win.

Personally, I'm getting really sick of the mods deciding what news is and isn't relevant and/or suitable for me.