This is what I thought, but I installed Wii U Sports using the Brazilian method, and after some time it gave me the you dont have a subscription screen, and asking me that if I had the disk to insert it.
Ah right, I forgot to mention that I also had to install the AOC content with WUPInstaller, since my DNS settings prevents me from opening the eShop, which might also be why I've never been asked about a subscription.