OK, common problem where the battery disconnect resets the immobilizer. Try leaving the car and ignition switch to ON for a half hour. This often resets it or it resets overnight. It shouldn't be activated by disconnecting the battery and this trick usually resets it.
Dealers and 99.9% of garage wouldn't have a clue. Only a few specialized tuners. I know malonetuning and kermatdi can do it but it's a bench flash meaning you have to ship them your ECU. The immobilizer light will still be active if it's wrong but it'll always start.
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