It's not... TubeHax blocks it. If TubeHax ever goes down, then your WiiU simply won't connect to the internet and won't be able to update regardless.
You can also still use the EShop temporarily while using TubeHax, after running the NNU homebrew.
Just to clarify and make sure you're using the proper TubeHax, your DNS on the WiiU should be set to 107.211.140.065
Yes, it looks like it. Secondary is 0.0.0.0











