His culture, village and connection to Wano, which is japanese inspired, all leads to Oda saying his real life nationality would be asian. It is a clear fact and even if nationalities such as those of real life don't exist there, many places are inspired by real life cultures and the production team will do its best to follow those ideas. And if Oda said Zoro is japanese, then Zoro will be played by someone asian. You don't have to like it or approve of it, and you don't have to watch the live action either if it doesn't suit your taste. We're simply stating facts.