What Master Black Moon said might not be entirely false, but it could not be entirely true, either.
Master Black Moon and Master Spiritual Vulture, two brothers who killed their master together, might indeed have such a deep grudge that they wanted each other dead no matter what.
But it was also possible that Master Spiritual Vulture had earlier discovered the ancient cave where the armor of the Pangu Clan and the heritage of the anterior Cultivators had been left. He intended to seclude himself for some time, but he feared that his enemies and his senior brother might find him. Therefore, he pretended that he had been tricked and met his senior brother gladly before faking being poisoned and falling into the abyss.
Chances were that, after grasping all the knowledge of the anterior Cultivators and forging eighty-one ghastly daggers, he would find his senior brother Master Black Moon and slaughter his entire family before he did anything else!
