Copyright infringement is about making a copy. It is not making a copy if you read a book. It is not making a copy if you watch TV. It is not making a copy if you listen to the radio. If Denys makes a video/audio file of himself quoting a large segment from "Friends", that's copyright infringement.

When machines train on a corpus of data, that corpus data is a copy and is almost certainly infringing on copyright (depending on how they acquired it). When machines use their training model and reproduce verbatim copyrighted works that they've been trained with, that copy is infringing (depending on licenses they acquired to reproduce copyrighted data).