Vivre cards always had canon information, Oda chooses to reveal some information that way.
For example that Sengoku has CoC or how high King's bounty is.
In no way do such things come from an editor or whoever is putting vivre cards together.
However, as I said, Oda doesnt have time to put them together himself and check everything.
Other people are working on it and adding information they found in the manga according to their understanding of them.
We dont need vivre cards, manga itself is more than enough.
For example that Sengoku has CoC or how high King's bounty is.
In no way do such things come from an editor or whoever is putting vivre cards together.
However, as I said, Oda doesnt have time to put them together himself and check everything.
Other people are working on it and adding information they found in the manga according to their understanding of them.
So when the Vivrecard says Mihawk is waiting for somebody who is superior in swordsmanship than Shanks. Thats from Oda