I believe that the 144k and the No-God are seperate. The 144k is the goal to shut off contact with the outside. The No-God however does that on its own, merely by existing. Before they arrived on Earwa, it was merely a hypothetical or failed theory. Without sorcery, their tekne simply couldn't realize the No-God's existence, and it remained pure conjecture. When they came to Earwa, and exchanged knowledge with the Maengaecca, the unity of Technology with Sorcery allowed them to finally bridge the gaps and create the No-God. If the No-God exists, they don't have to reduce the world to 144k souls. The No-God cuts off the world from the Outside by itself. That is why no children are born alive. No soul can cross from the outside to inhabit their corpse. They're either cut off, or swallowed by the metaphysical singularity of Mog-Pharau.