By this logic, isn't remembering something in your brain also a derived work? But that would not make any sense to protect until you create and distribute something based on that memory. The same logic should be applied to this.
If you remember it and make something that is a distinct work, something that may be steals the idea without reproducing any of its elements, that's never been considered under copyright.
I think that's going to be the litmus test for these AI. If you can get them to produce out both that is this things from anything else, it's not going to be a copyright violation because it's not a copy of anything.