Again, here you go.
He didn't call it ryuu. He called it Oden's special trick.
You can't claim Wano call all haki ryuu, including CoC, and then claimed CoC is different. Either they call all haki ryuu or they don't.
CoC/ACoC is rare power so they wouldn't have a more common name for a rare power nor would they call it the same thing they call a more common power. That's why it was called Oden's trick.
People really need to read the manga. The scene between Luffy and Hyou was Luffy trying to explain CoA haki. Not CoC or CoO haki. After Hyou used CoA haki, Luffy tells him that's what he's talking about. Nowhere during their interaction did they mention CoC or CoO haki so there's absolutely no reason for us to believe ryuu includes those type haki.
Later on when we are giving more information about ryuu the manga only shows us CoA haki, not CoC or CoO haki.
To claim ryuu means all types of haki is wrong.