The rules of Go very much are programmed in to AlphaGo. The neural nets are generic, sure. But the game rules programmed manually into the training system are vital to the system working. Even with MuZero: while it uses a world model which is learned, ultimately during training there is still grounding in the manually programmed rules of whatever game it's playing. When it trains on Atari, the Atari system (manually programmed, obviously) provides the grounding rules.
What I am saying is there is no analogous source of manually programmed rules to ground language models during training.
[0] https://en.wikipedia.org/wiki/AlphaGo_Zero
[1] https://en.wikipedia.org/wiki/MuZero
[2] https://arxiv.org/abs/1312.5602