As for Xuanqing, the reason he referred to the current Primordial True Realm as the Mythical Primordial is because now, in the Primordial True Realm, the power of the Great Dao cannot be reached, completely isolated from the world. Even if you freely modify history, the will of the Great Dao cannot punish you!
The current Primordial has no interference from the Three Paths of Heaven, Earth, and Human, and the Great Dao cannot reach it. It is completely governed by the world will left by Pangu.
However, generally speaking, as long as the sages do not act beyond the boundary, the so-called world will will not interfere with the development of the Primordial True Realm.
Xuanqing stood by the River of Time, looking toward the past and future. At the moment of the Primordial reshaping, an inexplicable great power covered the main axis of time.