Central Axis Relock is an interesting concept, and as you've apprently gathered, a rather radical one. I discussed it with its developer, Paul Castle, before we lost him too soon. Took a short class on it with one of his instructors. There was some stuff I liked (application on weak-side barricade firing with the strong hand, for instance), and some I didn't care for. Any class you take is going to be like that.
I don't believe I know the CAR instructor you mentioned, but my advice would be, go ahead and take the class. Keep the elements that work for you, and set aside the elements that don't. As Bruce Lee put it so eloquently, "Absorb what is useful."