It's progress, very neat progress, but it's not even progress in the sense that there are new kind of problems being solved. AI for Go and similar games has existed for a zillion times, but, given the huge space of the game of Go, it had never been that good at playing it as to beat a human.

Not to diminish that this isn't an achievement, but let's put it into context. To talk about being closer to AGI, a different kind of progress would need to be shown: AI solving different -new- kinds of problems.