Not long ago, he had threatened the will of Hell, but this is different from direct communication. He can communicate with the Mother Realm because he is a native dragon of this land, and threatening the will of Hell was due to its frequent active state and because Noah truly possessed the ability to destroy it.
But the world before him, even though it is in decline, isn't something Noah can easily destroy, so it wouldn't feel threatened. As a visitor from the Void, Noah would be met with doubled vigilance from the world, let alone he can't even communicate with it now.
Even if the world before him is in decay, it's still a gradual process. The World Will might not possess a clear consciousness, more likely in a drowsy, unclear state. Communicating with such a World Will is simply a fantasy.
"It's possible now!"
