Progressive economists typically peg median household income at about $45,000. But that includes households headed by 22-year olds (who are on their way up) and 76-year olds (who live on fixed incomes that may be small but are often comfortable since they have no dependents and limited work related expenses).
Among households headed by prime age Americans - adults between the ages of 26 and 59 - the median household income is about $63,000. For prime age married households the median income is over $70,000, and it is nearly $80,000 for two-earner prime age households.
The article is about "disconnects" between Democratic Party ideology and middle-class reality. I think that one could say the same about mainstream media, including the New York Times.