From what i gather he cant see certain dimensions except earth and can only grab souls from there

Yea but the thing is in cades own words he’s never seen anyone create a separate world like he did until Bonnie did. Like you said he watches-basically rules over earth there’s no way he wouldn’t have known about the world that 2 wicked souls created

I mean im sure he sees the creation of the dimensions he just cant see the dimensions themselves, like a weakness of his

Disconnect between Showrunners. I believe during Season of TO someone outside of Julie or Kevin was the showrunner.

Also per Arcadius words "during the moment of Enzo death you created a entire world linked only to you hidden even from me. Do you know how rare that is? In all my thousands of years no one has ever done what you did, like what I did"

Per this interaction he was shocked Bonnie was able to hide Enzo soul even from him. Indicating this has never happen before. So things like the otherside, Ancestral plane, Peace aren't out of Cades reach as per he words "in the thousands of years no one has ever"