Not really cause zoro didn't use normal coc on the roof
Zoro used coc coating on his weapons
So technically
Even if he knows coc
He won't know coc coating is a thing
Zoro used coc coating on his weapons
So technically
Even if he knows coc
He won't know coc coating is a thing
Think about it; he came from the timeskip with CoA, CoO and CoC and he knew he had all 3, but when Gyukimaru was talking about Ryuma forging a black blade, something made Zoro look shocked as if he just had an epiphany. This could actually have been the first hint at CoC coating.