Parking is not allowed on direction lanes (this one is a turn-right lane). You may halt your car there, but you may not leave it (thus park it). So while you can do this, you will also block yourself from doing much else.

Of course, a DDoS attack would be possible by having a couple of friends and switching the driver every once in a while.

A witty state lawyer may also try to sue you based on StVO §30 (1), though winning that trial won't be very likely, because you can simply stop the engine (allowed at traffic lights).

They could still get you for plain old obstruction. The thing about laws that makes them different from code is that intent matters. Even if you follow the letter of the law you can still get into trouble if you blatantly obviously try to violate its spirit.

I don't know the intersection but StVO §12 probably applies as it's likely to be within 5m of the intersection (3/1.) and thus parking isn't allowed.