Jeremy - the Skunk2 upper arms that adjust camber through moving the ball joint are not IT legal. The rulebook states (and you quoted) that camber adjustment can only be done through the use of eccentric bushings or shims. I know, I hate it too - stupid rule. Those arms are cheaper than eccentric bushings and easier to use. Do they have any significant advantage over the eccentric bushings? No, I can't see how. They both just adjust camber.
I think that rule was one of those things the IT board came up with a long time ago because they thought it would help keep the costs down. But in todays times, you can achieve camber adjustment easier and cheaper than with those stupid bushings.
I wonder if this is a rule we could get changed. Several other rules have been changed lately that were originally done to keep costs down but just don't hold water anymore.