The government is like the bank here, they know exactly what the default rate is. And then Strayer comes along and disputes the government's terrible figures. How would Strayer even know? The most they can do is call ex-students after a few years and ask them, but they would not say "I am delinquent", since they know Strayer cannot verify the answer.
Strayer does not mind if they are being lied to, since they are not only in the business of defrauding the government, but also deceiving their shareholders with good numbers so they can cash in their stock options.
This is like a bank saying loans are defaulting at 75%, and then the mortgage broker, who sold them these loans, disputes the number. Who do you think tells the truth?
Typically there are two great ways to find accountint fraud. The first is obviously finding a company with increasing earnings with the CFFO declining. The second way is to look for an unusual increase in eceivables, and then to find out what is being packed into the receivables. Is there fraud here? I can't say, but the increase in receivables is worth examining.