Gonna jump to shapely's defense here with the argument that works on nearly all of Karuu's high-tiers:
Are there even scans for a lot of this more powerful stuff Zeus has? The answer is...yes, but only for about half of the stuff, the rest is just non-existant
I could actually find 2 different immortality scans for Zeus, but one of them is reincarnation (non-applicable type 4 immortality) and the other is baseline regenerating from EE, which is usually Low-Godly without additional context.
they dont negate immortality, the voids themselves seem to have existence erasure and an unknown level of regeneration negation attached but not much else. It's also specified that Zeus likes to fight long-distance here...
There's quite a few things that contradict Zeus having omnicient IQ.
Damein straight-up stated that they managed to seal Zeus at one point before he escaped. Wouldnt a person with omnicient IQ know that he's going to get trapped? Similarly,
Damien was able to attack Zeus in chapter 0 - implied to be several times, and Zeus got himself trapped in the void despite the fact that according to IQ he should know how to escape it (he straight-up states "I cant leave").
Im gonna hop off here so I dont spend too much time with this, but Zeus is incredibly wanked. In fact, so is a fair amount of Karuu's stories, especially the high-tiers (it's why I added references when I was trying to help). It's the only reason I'm neutral for both Killer Nhazul and The Last Contestant, as everything does have potential but story should be priority over strength. And it isnt at the moment...
Dawn, for future reference in this thread,
here's the link to chapter 0 and here's the link for karuu's blog posts that have a bit more Zeus lore