This question can either be answered with a solid yes or no.
yes = the anime serves as a completion to the source material, providing more details when necessary and filling in the gaps when needed, whether with the author's direct approval or not.
no = the anime is just another medium to consume the story from, and the manga remains the definitive original source material, where every decision is directly decided by the author himself and his editors.
there's honestly no objective answer to this, since Oda himself has been recommending fans to watch the anime too and has said many times that he chimes in to approve some things, but yet at the same time, the anime can directly contradict some of the manga's points.