As I've posted before, I am the original buyer of the car. I ordered it from the factory with the factory installed spoiler.
My bare hand rubbing the surface did not cause the paint to deteriorate the way you see in the pic - the clay bar did.
Sorry, sonny, but you got lucky with the clay bar.
Why don't you try to use it on another part of the car. Don't do a huge area. Try to do alittle corner,see what happens there.