This seems very cool - I am sceptical of the supposed benefits for "civilization" but it could at least make for some very interesting sim games. (So maybe it will be good for Civilization moreso than civilization.)
I am a bit skeptical about how computationally expensive a very crappy Civ ANN would be to run at inference time, though I actually have no idea how that scales - it hardly needs to be a grandmaster, but the distribution of dumb mistakes has a long tail.
Also, the DeepMind Starcraft 2 AI is different from AlphaZero since Starcraft is not a perfect information game. The AI requires a database of human games to "get off the ground"; otherwise it would just get crushed over and over in the early game, having no idea what the opponent is doing. It's hard to get that training data with a brand new game. Likewise Civ has always been a bit more focused on artistic expression than other 4x strategy games; maybe having to retrain an AI for every new Wonder is just too much of a burden.