I have not had the time to check the judgment itself, but the interpretation does not seem to me so upsetting and out of line of what is normally done. A database can only be accessed for the purposes it has been established. Hence, a police officer who looks at the car/plate numbering database for other purposes than investigating a crime will indeed be considered not be authorised. Why should it be different for others?
On a different note, but with similar problems of privacy in terms of using data, but also collecting it.