The parties appearing before courts always spin their side to best advantage. My observation is that it is the courts themselves that are liars. When it comes to the right to keep and bear arms, the courts are a corrupt institution.
SCOTUS, like the other branches, is part of the Federal Government and has the same motive to preserve and expand its power. And in aggregate, the decision of SCOTUS have expanded the reach of FedGov and diminished liberty at least since Wickard. Thanks in part to them, there is nothing limited about FedGov and a great deal of what it has inserted itself into is certainly not enumerated.
I don't see how anyone can claim with a straight face that the FedGov is a creature of the States rather than their heavy handed master.