It's definitely cool, but the 4% win here is nothing compared to continuing AV1 rollout. I also agree that YouTube and Google in particular seem well suited to incorporate additional AI models to massively improve compression, particularly in their mobile app. A 300MB, finely tuned model (either as an AV1 upscaler or a pure deep learning model) is highly likely to be able to allow mobile devices to stream at 4k for the same bitrate as v9 480p.
