The LE in question claimed to be part of a task force from another (unnamed) country who discovered this video a couple of years ago on a hard drive/disk during a raid.
There was a video name posted, and at least one other commenter claimed it has been circulating and was on a number of sites. That could all be false, it could be another video, etc. The video in question did contain a youth as a perp and a youth as a victim, although the involvement of adults is unknown. From what I've read I thought that there was an adult voice off camera, so if that's the case then both minors are victims in my eyes.
My understand re: Minnesota and Wisconsin was that because of the t-shirt he was wearing, LE thought that he might be from that area or have passed through, visited relatives there, etc. because that's where the largest concentration of Minnesota sports fans are. There may be more linking it to the area that I don't know of, because that seems pretty weak on its own.