I bet it's because it was recently announced that the Mario Maker 1 servers would be shutting down. There's a group called Team 0% that is trying to finish every unfinished level in Mario Maker. There's a push in the community to get everyone to help. I wouldn't be surprised if this person bought a Wii U to help.
https://github.com/FailedShack/USBHelperInstaller you might start here for a program to download them. it'll ask for "that title keys site" which will be literally the first result on google for that search.