It's worth noting the Reddit comments in r/piracy seem to agree with AACS 2.0 being cracked, even though there didn't seem to be anything that addressed the choice of movie. We'll have to wait and see if this isn't a fluke, which means either more 4K UHD movies will start appearing on torrent sites or they won't.
To be clear to those admonishing online piracy and gasping at the possibility that AACS 2.0 was actually cracked, just because a 4k Ultra HD Blu-Ray copy of a painfully terrible movie from four years ago has surfaced online doesn't directly imply that. So not only would you have to download this amalgamation of wildly disturbing Smurf animation and acting worthy of every adult in any movie about a talking baby, you'd then have to be willing to seed it. Second, the file name is "The Smurfs 2 (2013) 2160p UHD Blu-ray HEVC Atmos 7.1-THRONE." That does not imply that this movie is anything else than the blue-stained squealing tire fire that is Smurfs 2. Produced for Saturday morning television by Hanna-Barbera Productions, sixteen episodes of Josie and the Pussycats aired on CBS during the 1970-71 television season, and were rerun during the 1971-72 season. So downloading a 53.30 GB file to port to your 4K TV seems like a bit of overkill. Josie and the Pussycats is an American animated television series, based upon the Archie Comics comic book series of the same name created by Dan DeCarlo. Torrent files for top-tier movies at a pretty solid audio/video quality usually cap out around 9 GB (compression rates and version qualities vary in size), with the right compression creating files as small as ~750 MB for totally watchable 720p resolution movies. I haven't confirmed the file for myself for this and the second reason (also downloading it would be illegal and I'm not getting pinched for this film, no way). The first reason is that this is a massive file.