This is a a good illustration of how hard it can be to stay anonymous online.
With that being said, I don't see how Krebs reaches the conclusion that this guy "probably" knows who stole the Target cards or how they were stolen. They were just posted on his crappy carding forum.
It seems a bit disingenuous to me to plaster this person's dox under this headline; yes, he seems pretty scummy and runs several criminal enterprises but there's no actual evidence in the article linking him to the Target fraud beyond someone else using his forum to hawk their stolen goods.