Just don't use your own name and don't call the one responsible for your. They may get suspicious and check. But there are many people here that left Germany and I can tell you that it is a case-by-case game.That's why I suggested him to contact the tax office and ask what kind of information they want to see.
You have two options. Either go down on profits and deregister then fly under the radar (can be coupled with a residency in Bulgaria/Switzerland etc. and train travel to Germany while paying some tax there. Alternatively, you move to a country with a DTA Germany, read the rules and fulfil those. This will be hard as you still have the PE risk in Germany unless you have substance (a girlfriend being director in a office) elsewhere.