There is a reason that the Supreme Gods did not find anything wrong with their followers since the means that the Shadow used was so unique that even in the Myriad Emperor World, no one has even used this method.
Because Wang Wei invented it.
The wine that these Gods were drinking had something extra inside; a pill called Spying Pill. Although the name is bland and unoriginal, its creation and use are quite clever.
Wang Wei asked the sect to combine the Heavenly Eye Talisman that can be used to spy on other people from thousands of kilometers away with a pill. That way, the power of the talisman can be crushed and fed to their target.
Then, they can view everything from the target point of view. They can even spy on the surrounding of the person.
This pill required quite the expertise to combine the runes of the talisman and the runes of the pill and ensure that not only do they not conflict, but supplemented one another.