How / is a National Health Service unconstitutional?

[Stranger in a strange land]

Congress could always pass a law saying "the Supreme Court can not rule on the constitutionality of this", like they did with Medicare.

Congress does not have the constitutional authority to ban SCOTUS from reviewing a law. The Supreme Court's power of review comes from the constitution, not Congressional mandate; that power wasn't something granted by Congress so Congress can't just take it away. Nothing in the constitution even arguably gives Congress the right to make itself immune to the other branches.

False.

https://en.wikipedia.org/wiki/Jurisdiction_stripping

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Wait, this has been a thing this whole time!? Why isn't this used more often?

Also, could Congress enact a requirement by statute that, for example, the Supreme Court can only strike down a law passed by an elected legislature by a margin of 6-3 or greater?