What does this (thought) experiment accomplish? That is, what point are you trying to make here?
Since we're talking about an electronic system the search index example is the more directly relevant one. Anyone who wants to object to LLMs is going to need to take care to ensure consistency with his views on Google's search index.
I wasn't aware I could read 95% of Harry Potter through constructed queries using Google's search index. Can you demonstrate how I might do this?
Also can you point out how copyright law changes because we're using an "electronic system" as opposed to an "analog system?"