Oh, I see the problem. The one you guys downloaded has Rival_Squid going to an invalid address. it's trying to write to 105EE9A44, but the right address is 105EEA44, at least in my game. Try taking out the '9'.I think we can safely say that we're talking about having the Squid form be the appropriate form for this mod. In this case, the updated code has not allowed the Squid form to be the Octopus form. Sooo, yeah.
Edit: Welp, I now have the unsafe Octohax on my Wii U. But the question is, does it really brick people's saves? Remember, Nikki was the one who had originally found this hack, and played with a few friends on private battles. I don't think that they said that their saves had been bricked. And, sadly I don't know how to fix this..
Code:
tcp.writestr(0x105EEA44, b"Rival_Squid")