The massive influx of information flooded the minds of all guardians and sect cultivators, pushing their brains to the brink of crashing.
From a theoretical standpoint... Senior Tyrannical Song shouldn't be the ruler of the Netherworld Realm.
As guardians guarding the Netherworld Realm passages, they had a basic grasp of Netherworld facts. The ruler of the Netherworld Realm was the corresponding half-body of the Will of the Heavens. Without pseudo-immortal body by proving his Dao and becoming the Will of the Heavens, it was impossible to give birth to the 'ruler of the Netherworld'.
Senior Tyrannical Song was still on Mars, battling immortals of the myriad practitioners in the universe, fighting for this cycle's seat of Will of the Heavens. He hadn't proved his Dao, so 'Tyrannical Song Ruler' shouldn't theoretically exist.
So what's up with this 'Tyrannical Scholar Ruler' title?
