So first of all Cohn and Miller are talking about a sample that a sample that looks exactly like Trump's base -- white, male, and not college educated -- and not as much like the electorate overall. (They deceptively hid that fact by opening the piece with a woman.)
Then they communicate a cavalcade of ignorant bullshit takes from people who don't know how the economy works, and allow them to misrepresent Trump's track record in office, without so much as a "to be sure" correction.