Somebody has to fix and maintain the machines. Those would be the people who raise the average to make it look like a box stuffer makes $30 an hour.
Industrial Mechanic (Millwright) 433A Certification Wages, Hourly Wage Rate | PayScale Canada
Millwright, that's far more reasonable. Salary is typically proportionate to responsibility.
The people featured in that news piece were not millwrights. They were the last of a long, long line of people who probably got their job right out of high school. Back in the 60s and 70s, these were the middle class but that's not true today, to earn the kind of money they are expecting they need a more marketable skill set.