These sorts of models pop here quite a bit, and they ignore fundamental facts of video codecs (video specific lossy compression technologies).

Traditional codecs have always focused on trade offs among encode complexity, decode complexity, and latency. Where complexity = compute. If every target device ran a 4090 at full power, we could go far below 22kbps with a traditional codec techniques for content like this. 22kbps isn't particularly impressive given these compute constraints.

This is my field, and trust me we (MPEG committees, AOM) look at "AI" based models, including GANs constantly. They don't yet look promising compared to traditional methods.

Oh and benchmarking against a video compression standard that's over twenty years old isn't doing a lot either for the plausibility of these methods.