The case of aircraft parked outside the gate and aircraft taxing hitting its tail it is the taxing aircraft pic that's at fault. There are plenty of incidents in rumours and news of that situation.
If the aircraft is under its own power and hits something it's always pic. It doesn't matter what is meant to be guiding you, if the markings are incorrect etc.
This is the major clash airports and apron want you to do as your told but will be the first to scream we are not responsible if anything happens. Don't worry if threats of mor etc are made for not complying. The one that i heard back about was a 5 Mmi chat with a flight ops inspector and the airport was subjected to a 3 day ground ops inspection. That was refusing to park with a 25knt tail wind. They changed the remote stands to any direction after that.