Look at BUILDING_ALCHEMICAL_SOCIETY in file C:\Program Files (x86)\Steam\steamapps\common\Sid Meier's Civilization VI\DLC\Ethiopia\Data\Ethiopia_SecretSocieties_MODE.xml
Essentially the table establishes that the Building can only be created by a player who meets some condition which is established via modifiers. The Secret Societies mode has a Governor Promotion GOVERNOR_PROMOTION_HERMETIC_ORDER_2 which has a modifier attached to it that allows the Building of the Alchemical Society instead of the University for that player.
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