Maybe you should send the number of the people who called to these guys.
inb4 "Your computer has been infected and this virus will slowly spread to your body and you will die."
Everyone on the site says if you are hacked you shouldn't format.
But whatever if it works for you it works.
And Nintendo is obviously talking about a non-hacked wii.
You should NEVER format your wii or that itself will cause a brick.
As for the stock, i do not believe there is a way. I think all you can do is remove priiloader, bootmii and homebrew channel using priiloader install and then hackmii installer.
Or I think you can make a new nand with...