I think that might have been KataGo rather than AlphaGo, but either way I wouldn't count on that sort of attack being successful in the long term. We haven't even had superhuman Go AI for a decade; the researchers are done with the basic algorithms yet. The current approach is basically random play weighted by win probability and I don't think they've really finished bringing in novel search techniques to explore the game space (pun intended, there'll probably be something big to find from things like http://eplex.cs.ucf.edu/noveltysearch/).

The fact that AI today isn't superhuman in every aspect is no real comfort. Post-AlphaGo humans don't seem to have any advantage that can be pointed to apart from having existed for more time. And computers move forward quite quickly.

Brains have been around for half a billion years. I'd say AI is putting on a pretty good show the last decade or so, considering.

Is there supposed to be major difference between KataGo and AlphaGo? Seems you’re arguing semantics there.

No significant difference, for our purposes they are more or less the same thing. But KataGo is an open source project out of Jane Street Capital and probably a bit stronger than AlphaGo (which was a Google project that was never released AFAIK). KataGo is also quite a bit bigger than AlphaGo in terms of popularity because people can actually play around with it.

It is like the BSD Kernel vs Linux - in many ways the differences are minor but they are different projects.