That's not a hack, if you operate the entity from Germany, it must be registered in Germany. It's often touted as a tax loophole, but it's not. Tax authorities do not care about you unless you actually make money, then they will come after you.
Would the liability shield not generally apply to a foreign entity registered in Germany? Sure there may be special rules for non-compliance with specific tax obligations, but I'm talking about for general liability for other purposes, like a contract signed by the entity where no personal guarantee was given, or a harm caused by the corporation where the owner was not personally involved or negligent in causing the harm.
Would the liability shield not generally apply to a foreign entity registered in Germany? Sure there may be special rules for non-compliance with specific tax obligations, but I'm talking about for general liability for other purposes, like a contract signed by the entity where no personal guarantee was given, or a harm caused by the corporation where the owner was not personally involved or negligent in causing the harm.