Ancient Chinese could not simply in represented in only Cantonese, it’s represented in every dialect of Chinese around all the China areas even the near countries. so your “Tang or Song official language is just Cantonese” I don’t agree with that. BTW Cantonese nowadays I think is not the same as it in ancient as well.
For example, “去” in “我去了” is pronounced as ke4 in the game and heoi2 in Cantonese which is different, and in dialect in Hunan province, it’s pronounced as ke4 which is the same in the game.
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