I agree. However, the reverse is also likely true, i.e., it cannot currently be denied that learning in humans is different from learning in artificial neural networks from the point of view of production of works that mix ideas/memes from several works processed/read. Surely, as the article says, copyright law talks exclusively about humans, not machines, not animals.
Edit*: Or perhaps put more pseudo legally that the created works infringe on the copyrights of the original human creators.
The above does not follow from, imply or conclude anything about learning in artificial neural networks and humans being similar or dissimilar.