As far as he could tell, the secret about his status as a nascent Reality was only known by Primordial Soul, and maybe Primordial Time, because if the rest of the Primordials knew of his status, he doubted they would allow him the time to develop.
Still, it would not really matter if the Primordials knew of his status as a nascent Reality, when many of the things he could accomplish had faintly exceeded the capabilities of any Reality.
In this space where only time and space existed, he had four million years to play with, and if his calculations were correct, barely a year would pass by in real time.
This technique was powerful, but Rowan could only use it inside of Reality instead of his Origin Land due to the weakened nature of this Reality's space. If he had tried the same technique inside his Origin Land, then he would have barely gained a thousand years of time.