Does tubehax still enable you to play online once spoofed to 5.5 with your legit disc games?
You're crossing systems. Tubehax is exclusive to 3DS and does nothing on WiiU. The DNS breaks youtube.com but blocks nintendo.update.servers
5.5 spoof allows online play with original disc. Loadiine allows backup play, but you're always playing smash so you can't access online/manuals/updates. Thats it for the WiiU for now.
The 5.5 spoof is applying a non-relevant system update that don't affect the core functionality of 5.3.2. Its permanent is true for now, but if you plan to go emuNAND the official firmware sitting at version 5.5 will mean nothing. Play online already before nintendo blocks everything or makes you pay.