In my jurisdiction downloading pirated stuff is perfectly legal. It's only illegal when you're distributing it. And even for jurisdictions where it's not legal even to download pirated stuff, companies don't much care about people who download, but only those who upload and as far as I know, you can discuss pirating all you want and nothing's illegal.
General discussion of illegal activities is legal, but distributed methods/keys/software to bypass DRM is not. In addition to the poster getting in trouble, the admins of multiple instances could at minimum be forced to delete the content, and at worst get their asses kicked by Nentendo's legal team, and be forced to reveal the identities of the user that posted it.