This isn’t true, but it’s 4am, and I regret that I can’t type out a full rebuttal on my phone.

One obvious counterexample is stylegan interpolations. If you interpolate between two images, the midpoint is usually unique — it’s often not obvious what the source material was. (E.g. Gwern’s anime interpolations; sure, they’re anime faces, but from where? “All of danbooru” might as well be “all styles of anime ever created.”)

Maybe someone else can argue the point further.