So the EU finds out that there is no conclusive evidence that piracy is harmful, but wants to bury the results. Since the EU is ruled by an aristocracy of bankers and their friends, its actions naturally reflect the will of the bankers and their friends, the super-rich, or as I call them, the usurer class.
You’d think they would be relieved that piracy isn’t hurting their billions. What’s at issue here is probably the fact that they cannot stand the thought of people enjoying their works without paying them rent. Even if it doesn’t harm their profits, even if these people wouldn’t buy their stuff if they weren’t available for free, to them it is still a crime against rent-seeking that someone should enjoy entertainment and knowledge without going through the systems they gate-keep (Elsevier and others).
It’s probably about power and control. They want control over the intellectual property their corporate entities produce, it is an insult against their sense of rent-seeking justice that someone should enjoy their works without paying them. It is not about profit, it is about how things should be.
You do not sit in the shade of my mansion, even if it doesn’t do me any harm, because I do not like the idea of anyone enjoying anything I have without paying me rent for it.
There is also the issue of the slippery slope. They probably feel that if they were too lax on piracy, services would develop that would make piracy too commonplace, rather than something limited mostly to warez dudes. So perhaps they wanted to bury this study in case it caused an erosion in their pretexts to have the gestapo hound pirates.
By the way, if, for science only, you were interested in knowing how pirates anonymously download movies, games and massive ebook collections from the internet, you may find this 2014 essay of mine interesting: How cyber pirates anonymously torrent movies on the internet