It's hardly a random employee's fault that Google lost the court case.
I doubt anyone would be fired for a $600k mistake. When you work processing legal requests, there is always a chance you get sued. If Google blamed their court losses on the employee that originally caused the problem... they'd have a hard time convincing anyone to do that work at all.
This person probably handles dozens of requests a day. There would have to be serious evidence of neglect for the employee to suffer any punishment.
They could probably write it off and somehow earn money on getting fined.