You not only distorted, but also misinterpreted the text provided, but first things first
You mistook the neighboring universes of Green Lanterns, existing within one layer, for the dreams of absolutely all creatures. You either didn't read it correctly or didn't understand.
And so my wiilworld took its place beside thousands of other willworld created by the Green lanterns that had been tested before me.
And from this text it turns out that within the framework of one world of Hal Jordan, neighboring universes of other green lanterns float. Is it written somewhere that we are talking about all dreams? Apparently not. Or did all living beings (child, artist, etc.) become Green Lanterns? Also no. Then why did you blatantly lie and distort the submitted text, which is completely unrelated to what is presented in the comic?
Several of DeMatteis' comics make it clear that universes are nothing more than holograms of the mind. So if she is a hologram, and ordinary beings like Superman cannot understand the higher abstract beings from the world of the individual and collective unconscious, then why does it appear from your words that they exist on the same level of existence? Is Demattheis contradicting himself? You made a good mistake in your own reasoning and evidence
Yes, you divided cosmology into different authors, and use the cosmological device of another author, very good. The only problem is that several times it is indicated that the universe is just a hologram, an illusion or a dream of someone from above. What have we learned from the Green Lantern comic? That universes are created by the same people with their imagination, which can only be the dream of someone else’s dream.
We return again to the topic of why the universe is only a hologram, and creatures from this universe cannot comprehend creatures from a higher world, and moreover, these creatures (aliens) are more real than the universe of the character from where he came (Superman). A very good archetype and existence on one plane of existence, which for some reason does not work.
We were directly shown that Hal's universe is only a dream of a boy made of inflatable bubbles, and the boy is only a dream artist who perceives a lower dream in a ball. What is implied is that each dreams is only a dream of the other, and not that the lower dreams sees the higher one (this was not even shown, but quite the opposite).