I like this title far more than eg "Reporter discovers likely identity of bitcoin author"
The question headline is more compelling, but that's because it creates a false expectation that the question might be answered. It lends itself just as well to sensationalistic headlines like "Did Obama just give the order to nuke France?"
Given the content of the article, it would be an inaccurate title to say "reporter postulates that Michael Clear is the author of BitCoin" because the NPR article implicitly argues that Davis is probably correct. In this situation, the question is perfectly appropriate to express some level of doubt, but a likelihood of truth.
If the thrust of the piece is that you think Michael Clear is the author of BitCoin, then an accurate headline would be something like, "Joshua Davis just might have unmasked the author of BitCoin." This reflects the thesis much more closely than the original.
I get downvoted a lot.
This is an actual open question, though. I have no problem with that.