Everything worked fine up until the car battery replacement? What is the replacement battery?
Any chance the terminals were reversed when the replacement battery was put in?
You don't see all the idiot lights go on when you turn the ignition on.
The battery in the remote has noting to do with starting the car. A dead remote battery or no battery just means the remote will not work. You can take the battery out of the remote and it will still start the car. The valet key has no remote or battery.
A code reader is not going to tell you why the car will not crank over. A code reader is for emission related faults.
Removing or replacing the car battery does not "unprogram" the remote or valet key.
This is a mystery.
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