You were the one to make Leviathan's profile for the Endbringers. I've noticed that your reasoning for their core having Multi-Continent Level dura is that the author says Saitama could break it with a punch.
Ignoring that this would mean the core would be planet level with Saitama's changes since then, Is it really acceptable to use the author's WoG comparing to other franchise's characters when creating profiles? Wildbow says things like Leviathan being faster than Post-Crisis Superman (MFTL+) when underwater, and that doesn't seem right to me.
The WoG explicitly addresses Saitama's feat, he wasn't just going "uhhhhhhh well I think Saitama can do it". He said someone that could redirect a planetary attack would be able to destroy their core, and then someone said it was only surface wiping to which he said that would still be able to do it.
The Superman WoG wasn't intended as "He's faster than Superman", just as a general comparison of how the speed tiers are in-universe.