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.