This is also why a single Cyan Gorge Covenant can suppress the Yunxi for more than thirty years. Everyone still has to comply with the court's instructions to conduct affairs for appearances, and to cancel the Cyan Gorge Covenant, they still need to launch a righteous-evil war to pressure the court. But even so, on the surface, they still accept the court's conferment and jurisdiction.
As for their ability to act as they please in the Yunxi Land, it's because the local government offices in Yunxi are controlled by them. Whether it is murder, extermination, or expelling external officials to control the populace, they still act in the name of the government office.
For example, this time, the Yunxi Martial World is besieging Gu Zhan.
