David Andolfatto states correctly as follows:
Mainstream economists, like myself, like to point out what matters is not technical default but economic "default." An unexpected inflation whittles away the purchasing power of those caught holding old money as new money is printed to pay for whatever. I think it's clear that MMTers understand this too. This can be seen in their constant reference to an "inflation constraint" as defining the economic limits to government spending. [Source]
The Chicago School of economics is extremely libertarian-capitalist leaning. That they would design a survey on MMT without including MMT economists in the formulation of the questions is rather manipulative, whether intended or not, because they did get the questions completely wrong, as David points out very well.