But the theory fails because this fits it but isn't wireheading, right? It wouldn't actually be pleasing to play that game.

I think you are right.

The two are errors that practically, with respect to hedonistic extremism, operate in opposing directions. They are similar in form in as much as they fit the abstract notion "undesirable outcomes due to lost purposes when choosing to optimize what turns out to be a poor metric for approximating actual preferences".