I get a location with accuracy to about 800km.

Does seem somewhat calculated to trigger outrage.
On his actual blog he attempts an explanation of the IP tracking by saying it is similar to a method described here:
http://evertb.wordpress.com/2012/09/26/tracking-a-troll/
but the method described is far from convincing.

That story is AWESOME!
What a wonderful feeling of vicarious revenge I have now.

  My Julio was autistic and would wake the neighbourhood at 1 am with his shitty guitar playing. Asking him to stop he would simply say (straight face) "I'm trying to become rock star" - and slam the door in my face. He would crank his music at all hours - smoke too many bongs and fall asleep with Eminem pounding on repeat. Oh the thought of his stereo falling six floors to its demise makes me giddy with happiness.
And you got away with it. And the obnoxious peace-thief was actually made to pay. Oh, what a beautiful story.
Oh, how unfortunate such outcomes are so rare.