Oda is definitely trolling with this Zoro CoC stuff
First there's Urashima getting scared of Zoro's "aura" and then this stuff with the earthquake
Oda knows this a theory in the fanbase that Zoro has CoC and he's fucking around. I'm sure very many Japanese readers sent him letters about this theory and he's baiting them now.
The frequency of this bait in Wano means one thing, if Zoro doesn't show CoC this src, he never will. Oda nows this is the expectation and he knows the fanbase will give up on this if it literally doesn't happen this arc