Comment by ulber

I think you misunderstood the approach. MuZero is being used to optimize the choices made in the VP9 compression. In modern video encodings there's many ways to encode the same content. As a very simple example, you can vary how often you provide a full encoding of a frame and how often you encode differences between frames. Once this off-line optimization is done, the result is still a valid VP9 encoding, just a smaller one. MuZero is not needed for decompression at all.