People don't get it.
The article is not trying to stop people selling copies of out of copyright works, it is against people who are doing that using the copyright on their editions to deny public access to other editions that are not copyrighted. To borrow a previous analogy, it is like a cinema you cannot get to preventing you from attending a cinema you can get to.
A better one: a specific recording of the Berlin Philharmonic playing Beethoven's Fifth Symphony conducted by Herbert von Karajan can be copyrighted. But you cannot use the existence of that copyright work to prevent your local secondary school orchestra from playing the Fifth at prizegiving. This is established in that area. So the article is right to object to it not being similar wrt written work. It is clearly a land grab and is equivalent to the enclosure of common land. It should be opposed.