Daozi wanted Song Shuhang to lend him a helping hand—but in fact, he was going about it in a roundabout way to give Song Shuhang a benefit.
With his 8.5 level authority as Wielder of the Will, even without involving Song Shuhang, he had plenty of ways to solve the curses on the cosmic demons.
Even among these solutions, many were easier and more convenient than going through Song Shuhang's projection of the path to immortality.
But as a scholar of Confucianism, Daozi always thought of reciprocating Song Shuhang's kindness—with anything good within his capabilities, he always thought to include Song Shuhang.
If, in the future, Song Shuhang was willing to lend him a helping hand in solving the curse on the cosmic demon race, it would surely consume a lot of energy. However, the gains would be even greater!
First, after lifting the curse, Tyrannical Song would gain the gratitude of the entire cosmic demon race, earning substantial goodwill.