He was there to see the underworld dimensions be destroyed. He never saw other universes being destroyed.
Hercules makes a comment about how generates seeing things like amadeous... Yet resorts to punching things with his fists again... And never could thing of anything... Never proving his actual intelligence.
The only good proof anyone has offered so far is the argument that impossible mans ability to pop in and out of this universe was something chaos kong COULD do... Not that he ever did since we never saw more than one of any skyfather... And skyfathers are not like abstracts each universe has their own...
Early on chaos king talks of killing the gods of this universe and going after earths gods.... He doesn't say a certain universe or realm... He'll even Nate grey when he was fighting qabiri and earth hopping knew what part of the actual multiverse he was in...
Even the cancerverse showed us our universal opposites... Etc..