If I take a picture of Mickey Mouse, add 1 to each RGB value, it would still be covered under copyright.
I think the term 'learn' is doing the heavy lifting in your argument here. Specifically, your argument seems to be:
1. We use the term 'learn' as shorthand for 'fitting a machine learning algorithm to data'.
2. We also use the term 'learn' for a human looking at copyrighted material to practice their craft.
3. Humans using copyrighted material to learn doesn't make their works derivative.
4. Therefore, machine learning algorithms that are trained on copyrighted material aren't producing derivative works.
This argument holds an implicit assumption: if we use the same term for a process, it should covered by the same rules/laws. Which I think isn't very sound.