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Cleansing the Demon Realm might sound grandiose, but in truth, it's hardly worth mentioning. For Xu Yang, it's just like going through the motions, the meaning of which, though non-existent, is not that significant.
After all, the Heavenly Demon is dead, its soul dispersed, and what remains are but walking corpses. Even if an insect with a hundred legs dies and does not stiffen immediately, without conscious control, its strength is limited, and it hardly poses a challenge.
Even against a Divinity Transformation level Demon Head, with careful planning, they can still be slain.
It's merely a matter of outlasting them over time.
The Corpse Resolution Cultivators ended the Dark Chaos in this very way back in the day.
The same principle applies now, even more securely, because Xu Yang is supporting from behind.
A hundred years have passed, which is not too long, but it's enough for him to advance further, stepping from the Golden Core into the Nascent Soul Realm.