Why, though?
Is it because we can't explain the causal relationships between the words in the text and the human's output or actions?
If a very good neuroscientist traced out the engineer's brain and could prove that, actually, if it wasn't for the comma on page 73 they wouldn't have used exactly this kind of bolt in the bridge, now is the human's output derivative of the text?
Any rule we make here should treat people who are animals and people who are computers the same.
And even regardless of that principle, surely a set of AI weights is either not copyrightable or else a sufficiently transformative use of almost anything that could go into it? If it decides to regurgitate what it read, that output could be infringing, same as for a human. But a mere but-for causal connection between one work and another can't make text that would be non-infringing if written by a human suddenly infringing because it was generated automatically.
They love to publish drivers that worked with like 1 release of X 5 years ago when the card came out and never update them.
Except when they update them and it breaks X.