The article state clearly that all of those women are wives and mothers and employed, each contributing to the household finances.
I know way too much about them, but ended up doing a little more research to get more concrete details below. In brief, while they all contribute to the household, it is not as much financially as the article portrays.
JobsIn Utah:
#1 Meri used to have a part-time (or low paying, don't recall which) job which she was fired from when she went public with her lifestyle
#2 Janielle had a thriving business or job and was the most economically sound of all of them, bringing in real wages
#3 Christine was a stay at home mom
#4 Robyn had a job she gave up when she moved to marry the husband, Kody
Kody had a job and worked.
After the move to Nevada, they struggled, using up the retirement money (and show money). They've capitalized on the show with a jewelry line, which it's unclear how successful it has been. They tried to start a gym, which didn't really work. Janielle got a real estate license, but Christine flunked the exam. (Not sure if Christine later passed or how successful this has been.)
Public BenefitsChristine received public benefits even after filming began (able to obtain them due to no job and official single mother status). Robyn has said she's received public benefits.
Bankruptcies:Christine 2010
Kody and Meri filed 2005
Janielle 1987
But of course, they live a mustachian lifestyle otherwise...with Cody's fancy car habits...
In the big family world, the Duggers are quite a bit more mustachian, with fewer adults to bring in paychecks too.