"[Navient pointed out]...more than 40 percent of loan balances it services for the Education Department are enrolled in income-based repayment plans." Over 40% of people with US Government-sponsored student loans--which were presumably taken out in order to advance the career prospects of the borrower--are not being paid sufficiently to repay their loans on the basis of their original issuance, _and this is presented…
Navient is a debt collector. They were sold loans owned by the US Dept of Ed (or hired by the department of ed maybe?)
"more than 40 percent of loan balances it services...." means that out of the loans that the US Dept of Ed decided it can't collect on anymore -- many of those are using the option that would benefit them the most.
The article talks about Navient saying one thing: "we want to help all of the borrowers because they are actually not just borrowers but citizen/constituents"; while doing another: "thanks for calling Navient, having trouble paying your loan? Just hit the loan-pause-button and we will pause your loan for 24 months. No, we will not tell you this but you could have asked for the 'smaller loan payments because you're not earning much' button'."