The reason is that the question title is used when the reporter is unsure of the facts. If they knew the answer they would make a declarative statement in the headline "Bitcoin Author Discovered by Reporter".
Not sure why you are getting downvoted. I think that it's one of those "Internet Laws" but I can't find a reference as my Google-fu is weak.
I think it's an HN thing. At least, I heard it here.
I get downvoted a lot.
I think I heard it here, too. It's funny how often the rule works, mainly with sensationalist news stories. "Is this the iPod killer?" No.
He's getting downvoted because his comment doesn't add materially to the conversation.