Seriously, anyone that thinks this is a trivial achievement - find a Go club or someone that knows how to play Go, and play a few games. Then you'll get some idea of why getting a computer to play Go well is a far harder proposition than getting one to play chess.
I don't know. As I wad reading the prelude to the article, and these replies, I'm saying to myself "Go still has rules to follow. When a computer can play a good game of Cards Against Humanity, get back to me."
That is, when a computer can work in a system that does NOT have known rules, but still do well, you will then have "intelligence", not before. Sadly.