It's wild that anyone doesn't know that. It's less surprising than the fact that disallowing someone with 34 felony convictions from being President would also require a Constitutional amendment. Both the pardon power and the qualifications for President are specified by the Constitution, so of course the Constitution must be amended to change them.
I made no assumptions. Or if my "It's wild" makes assumptions, then surely your "That's wild" does as well. But really, neither do--they are simply expressions of a disparity between fact and expectation or desire.