Hao Ren was already inured to the truth and falsehood within the Black Forest, as he realized the concept of truth and falsehood is meaningless here.
He knew that L'Haronne had gone through destruction and rebirth, but he could postulate that the planet had not just only encountered that one apocalypse in the past ten thousand years. This was the Umbral Realm, a fragment of the universe, the only surviving piece of the universe that was once destroyed by the Mad Lord and as the only remaining intact celestial body in the Umbral Realm, it had gone through another form of apocalypse.
After going through multiple cycles of destruction and rebirths, everything bizarre would be the norm on this planet, and Hao Ren reckoned that this Black Forest was a 'distortion node' left behind after the planet's end.