Then I can reply by saying that it was not a "gutting," the supreme court was blocking a new regulation on the grounds that it was beyond any that had been enac

Then I can reply by saying that it was not a "gutting," the supreme court was blocking a new regulation on the grounds that it was beyond any that had been enacted before, and in their opinion (using the previous fact as evidence) beyond what Congress had empowered the EPA to do. No presently enforced regulations were overturned.