It’s probably just meant to be for people that wouldn’t watch the animated series under any circumstance.
I’ve never watched One Piece the anime (yet) and I keep putting it off because of how fucking long it is. I don’t know how faithful the Netflix adaptation is, but I enjoyed it a lot; so much that I might finally start watching the anime.
I don’t expect those of us who like the animated Avatar to enjoy the live-action adaptation as much, but there are surely people who will, and they’re probably the ones this is for.