There was zero difference between the Dreamscape and reality. Therefore, the events that would happen next would be a direct reflection of reality.
So, by observing three decades in the Dreamscape, Compass Carburettor was obtaining information regarding three decades of that universe's future.
Considering how this information was regarding the most vital experiment that Martial and the Waning Essence System were banking on, Compass Carburettor was reaping profits thirty years in advance.
Once he mines all the resources from the Dreamscape and leaves, even if Martial and the Waning Essence System wished to catch up to him, they would require three decades of progress.
This was how Compass Carburettor branched into the Realm of the ultimate concept—Time—through his power of Dreamcraft.