FWIW, (and, it's your pool not mine, so probably not worth a lot) I'd be absolutely fine living with this. It's not going to affect anything structural.
What kind of coping/pool deck are you going with? If you're coping is going to overhang then that can easily be covered up to the point where nobody will notice it's not perfect square.
Maybe I am less OCD about this because I'm not paying for it, but with the concrete already poured I feel like you're going to end up going through more hassle than it is worth. If the PB agrees to fix it and it can be done by just adjusting the turnbuckles and pulling the tops of the wall back, then great. But I'm not sure I'd want to hold up progress over this.
Again, just my .02 and others here with more experience probably disagree.