My NNID with 022-2812 work... with the nintendo site and miiverse
They are lost forever for 3DS use, logging into a banned NNID on a new console that system transferred from the banned 3DS will result in the new console being banned.
Like I mentioned earlier, the access ban is server side and will ban any 3DS that can log into it. So far, only a system transfer with blank NNIDSave.bin works to move the NNID but logging into the NNID bans the console.
Since the Wii U is not a 3DS, the ban does not apply to the Wii U.