He knows that divine beings don't like the rank 5 cultivators of their pathways, so he doesn't plan to help any rank 5 cultivator steal the divine position of another divine being. That way, he won't draw the ire of the collective group of divine beings.
Instead, he is only planning to help create new Divine Positions. And while he knows that not many rank 5 cultivators will sign up because they are afraid of him, and that even of the few that sign up, even fewer of them will succeed in transforming their mutated Life Ability into a Divine Metac for various reasons, there is nothing for him to lose by offering this service.
His ultimate goal is to eat the rank 5 cultivators who succeed and gain their Divine Metacs. That bit of lifespan that he is asking for is just bait to lure his prey in.
