Yes, I realize the book is a half-joke or Zen Buddhism for dummies, but it is still half serious and applying these principals to TES makes for interesting discussion.
Basically what it says is that order and disorder are just human constructs made to rationalize the universe and that existence itself is in reality in a form of sublime chaos. If Discordianism is real in the TES universe, then Anu and Padomay are not real and were only constructed so that that mortals (and the gods) could cling to some sort of false order. Could it not be said that the Gray maybe is the only universal force? If this is the case, then what was the point of Mundus? Shezarr created it to transcend the dualism of the universe and go back to the gray maybe, but what if that primal existence was there all along and he (and the other gods) had just set up to many rigid structures to notice?
It has already been said that the border separating Oblivion and Mundus is thin. If Aetherius is not any more orderly then Oblivion which is not any more disorderly then Aetherius then what makes these places any different at all? If everything still just gray maybe and Mundus is supposed to be a manifestation of that primal chaos, then what makes Mundus truly any different then the other realms?
I submit that: Anu and Padomay don't exist, Aetherius, Oblivion and Mundus are all really the same place and the final subgradient was there all along right in front of Shezarr.