“Specifically, at the URL, the Repository hosts and offers for download the Project, which, when downloaded, provides the downloader everything necessary to launch and host a “clone” infringing website identical to Nyaa.si (and, thus, engage in massive infringement of copyrighted motion pictures and television shows).”
The repository contains no movies. It is the code for a torrent index, the same kind of software that runs legal trackers too. The MPA wants it gone because of what someone might do with it. That is the youtube-dl theory again: go after the tool because the users are harder to reach.