Paying off a credit card destroys money.
So what?
If all debts were paid off then there wouldn't be any money.
Why would all debts ever be paid off? What would people do with their savings?
Pay off debts, of course.
Never said that it would be a reality - just letting folks know of the important concept that paying off debt reduces the money supply in the amount of the paid off debt (assuming it's bank-owned debt).