That is an incorrect link.
First of all, the accounting irregularities you are referring to were irregularities in the value of FNMAs portfolio. These types of irregularities would only effect the value of the stock price, not the stability of the housing market.
Second of all, these irregularities were discovered years prior to the "sudden" housing crisis. Since no one expected the housing crash, it would he completely counter intuitive to believe that a reported and penalized accounting issue would be related to it.
Third, I dont believe it is a stretch at all to say that the GSEs were completely innocent in the housing crash. As I stated, there is really only 3 things that a corporation can be liable for...an intentional tort, negligence and a crime or SEC violation.
It is quite clear that the GSEs didnt intend any act that caused the housing crash. It is also quite clear no crime or SEC violation from the GSEs were the cause of the housing crash.
As for negligence, there were probably some actions by the GSEs that could be considered near negligence...such as not performing a more in-depth analysis into the mortgages they were rolling up...but no action of the GSE actually fits into a legal definition of negligence...and the main reason for that is that they were being lied to by the banks. It would be impossible for the GSEs to expect to be lied to, and without the possibility of that knowledge, they have breached no duty to investigate.
So, yes I restate that the GSEs were not in any way, form or fashion, the cause of the housing crash.
