There's nothing they could do for pirates.
I'm obviously talking about flashcart users here, not legal users who got that issue and that nintendo can unban by showing proof that they didn't pirate.
They will not do anything if you don't/can't prove you didn't use flashcart/emuNAND/whatever.
About the thread title:
I used the word "supposedly" because the error on their website doesn't state that it's a ban. It's either an access point issue, or a "just call us" page (it changes back and forth after multiple refreshes).
I didn't use the word unban, as it's not officially called a ban. Users reported they can go online again which is correct, I didn't lie.
There's no official word that it's a permanent ban or a temporary one (but it looks like a temporary 15 day ban). There's no official announcement from Nintendo that they are banning users (though, their EULA should cover it).
I think 15-20 reported banned users is really small for a real ban attempt, they could have banned everyone! why 15? why these users only?
I don't say that it wasn't a ban at all. Just that for a ban attempts it's not widespread and there's no official banning announcement.
now users are back online, and the error page is back to access point issue, like if nintendo covered it as a simple error on network connection.
I know that the OP called nintendo representative and they asked him to show proof.
I didn't know that console without NNID was banned too, I guess I didn't read all the ban cases.
It's NOT a mac ban, as MAC has been spoofed and tested, it looks like I'm not the only one not reading all ban cases and troubleshooting.
I only stated the facts, not adding suppositions to the OP.
Edit:
It doesn't look like an automatic 15 day ban lift, as one user reported being banned only 5 days, and unbanned along the other users in the unban wave from yesterday.
So, it's not automatic, it probably requires manual intervention from nintendo if it's really a ban/unban.