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It says so in Rivi's intro. And Ending D in YUPSP states that the Magi are the gods.
Uh, please give a text dump? I haven't reached Ending D in YUPSP, but in Riviera and Kitten, the Magi are NOT the gods. If YU hints otherwise, then it would be due to narrative perspective: the ignorant humans are the ones whose perspectives are represented, so anything they hear/misbelieve is what we're given as narrative truth.
Писатель всегда будет в оппозиции к политике, пока сама политика будет в оппозиции к культуре.