You've not read the report. German law does allow revealing medical data to protect others.
Yes, it does. But only if it is very obvious that lifes are in danger. And even then an MD is open to a criminal case against him, the patient can sue him for any damages he has a result, which is millions in the case of a young pilot (the rest of his lifes income in that job) and of course he might lose his medical license as a result. The limits to report a patient are very high indeed. As mentioned above, a direct result of things that happened in nazi germany. Since nobody is required to truthfully state his occupation at his MD, privacy laws would have to be changed for everyone, and that is not going to happen in germany.