In fact, this matter is strictly confidential to cultivators of middle and lower tiers, to prevent various troubles in the cultivation world, as it would cause unrest regardless.
Even when disciples from various sects go down the mountain to train, they don't know the significance of the repair work they are doing, only understanding it as a meritorious deed that brings them virtue, a classic case of "knowing what but not knowing why."
Xuanji Zi considers Chu Xuan as a true core disciple, which is why he spoke to him about these matters ahead of time.
Just like Gu Haitang, who has a special status in the Purple Heaven Jade Mansion, thus she was able to learn the inside details in advance and discreetly remind Chu Xuan.
Chu Xuan was grateful for his martial uncle's trust and promised not to speak indiscriminately about this matter.
...
