You have it wrong. The man behind _why deleted his online presence because he grew tired of the persona and everything around it. At that point, people began searching for _why. This culminated in a Slate article that openly divulged his identity.

That, is of course, crossing the line. If someone wants to distance themselves from an online tag, they should be allowed to in peace.

Now, however, it seems that he's brought that persona back to life. He's posted a new puzzle, and brought his site back. Obviously, he wouldn't do that if he still "just wanted to be left alone." That's why people are excited.