I couldn't see where the concrete is separating. If I were you that would be my BIG point. The liner having a few wrinkles, well, that's hard to avoid. The wrong liner? That's either his cost replacement or a big discount.
The stains on the concrete may well fade--they almost look like red clay. It's possible a chlorine wash may clear them, but I don't recommend it at this point.
Concrete separation says to me that a) the ground wasn't prep'ed correctly and will get worse b) the re-bar or wire wasn't done correctly c) the concrete was too wet or too dry and not properly floated in to get out all the air or d) the concrete had the wrong formula. Or all of the above. The concrete specialist was a great idea.
As for tearing out your pool and putting a lien on your house, that's a threat. He CAN put a lien on it but if you've documented everything, and, more importantly, have started the legal process, it won't stand.
Also, if you have decided that he is NOT competent to continue, then you can forbid him to step on your property . Then if he tries to tear out the pool it may be trespassing or even criminal trespassing.
I HATE a contractor who screws up and tries to slime his way out of responsibility. I've had it with a kitchen designer/installer--I held back the last payment, but I had it SO well documented that I was within my contractual rights that I never heard from him. I also had it with a roofer whose brand new install leaked. After a while they wouldn't take my calls.
I'm sorry you are going through this...when a dream becomes a nightmare.
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