Since Human Dao cultivators are not suppressed by the Heavenly Dao of this Realm, why would they trade with Li Zhirui?
Because the items traded between the two parties were not Purification Lotus Seeds, but intelligence gathered by him from various regions!
Li Zhirui, in order to better and quicker locate more forces of the Primal Spirit Realm, would collect intelligence about his surroundings every time he arrived somewhere. He might not claim to know the area thoroughly, but he had some understanding of the general distribution and strength of the forces there.
As the Great Zhou dynasty represents the Human Dao force, they rely on Human Dao luck for growth and expansion. Therefore, their constant endeavor is to expand the dynasty's control in the Golden Light Realm!
During those previous times, they were laying the groundwork, and now their Inner Strength has accumulated deeply, it's time to expand externally.
