I remember the original post the author is referring to. I was captivated by it and thought it was cool. When I ran the original mentioned in the post, it detected my one of my alt's that I forgot about. OP's newer implementation using different methodologies did not detect the alt. For reference, the alt was created in 2010 and the last post was in 2012. Perhaps my writing style has changed?
I usually just create a new account every time I get a new computer or reinstall OS. I thought most of the results here were noise, but after closer inspection it just found 10 accounts I forgot having. Actually incredible and a little scary how well it works.