You should be fine, B9S is pretty similar to A9LH, and all you're doing is dumping system files, with can be done with the same old GodMode9 or whatever you prefer.
Is it really that bad that people are being banned from playing online though? Also, couldn't people set up their own servers to connect to with our new best friend, SigHax?
If you look in the guide you provided it says "Note that this won't work for the 022-2812 or 002-0102 bans given to Sun/Moon players who used online functionality before release." But it says there is another way here. How would I install the .plg file?
002-0102 still remains when i try to use friends list
022-2812 remains when i try to create a new nnid
ah, so the only thing i really need to fix is 022