The triangulated strut bars that connect to a firewall were already illegal. Their intent was to make the typical strut bar illegal because it provides rigidity in more than one axis, just like the cusco bar does. They rescinded it because that made pretty much all of them illegal, which opens up an arguement that the cusco bar should be legal as well.
I'm not looking for any loopholes, just trying to get the most out of the rules. These simple parts should be legal in a class like SM where you can go nuts with engine/drivetrain swaps, expensive coilover setups, etc, etc. But god forbid you put a strut bar that mounts at both ends of your lower control arm. That's what's wrong with autocross today.