The Constitution means what the Supreme Court says it means.
The Constitution does give Congress the authority to curtail powers not spelled out explicitly in the Constitution,
but I have never heard a case where Congress did so, and I wonder if there has ever been such a case, a major case,
in the nation's history. Why I do not know, given the perpetual screeching that is directed at the Federal Courts
from the Right, from the Left, and and from the Center.