Meh, AI doesn't break information theory. The relationship between the prompt size to the "similarity" of the result will be such that it doesn't beat traditional compression techniques.
At best we might consider it a new type of lossy (or... replacey?) compression. Of course if storage / RAM / bandwidth keeps increasing, this is quite likely the least energy efficient technique available.
If the compression can take into account the sub-manifold of potential outputs that people would actually be interested in watching a movie about it can achieve enormously higher compression than if it doesn't know about this.
