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.
The immo is flashing because the cluster is different. The SKC number, the correct VW tools, or a computer reflash to remove the immobilizer are required to put in a new cluster with your model year.
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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