No, it means your contention informs no part of any debate over whether the President acted constitutionally in ordering warrantless foreign intelligence intercepts.
I don't need to establish anything beyond citing the In re: Sealed Case court's observation that "FISA could not encroach on the President’s constitutional power", and noting that the court's observation stands as the soundest and most authoritative legal argument yet advanced regarding FISA's impact on the President's actions.
Of course it forms the crux of the debate. Congress has regulated the exercise of the President's powers of domestic law enforcement, and these regulations have not been condemned as uncosntitutional. Since they're constitutional, the only way that your contention could be correct is if there's a two-tiered system of the President's powers. Since you've condemned the whole notion of such a two-tiered system, it follows that your contention about Congress's powers over the President is incorrect, by your own standards.