It seems the story isn't saying it was a coverup but commision counsel agreed to lie about 9/11 is a fact
http://nearing.newsvine.com/_news/2009/04/14/2684229-in-book-911-commission-counsel-reveals-government-agreed-to-lie-about-911
"Make no mistake, Farmer is not saying that 9/11 was an inside job, however, Farmer's testimony, along with that of his fellow 9/11 Commission members, conclusively demonstrates that, whatever really happened on 9/11, the official story as told to the public on the day and that which remains the authorities' version of events today, is a lie - according to the very people who were tasked by the government to investigate it.
This is a fact that no debunker or government apologist can ever legitimately deny."
http://nearing.newsvine.com/_news/2009/04/14/2684229-in-book-911-commission-counsel-reveals-government-agreed-to-lie-about-911
"Make no mistake, Farmer is not saying that 9/11 was an inside job, however, Farmer's testimony, along with that of his fellow 9/11 Commission members, conclusively demonstrates that, whatever really happened on 9/11, the official story as told to the public on the day and that which remains the authorities' version of events today, is a lie - according to the very people who were tasked by the government to investigate it.
This is a fact that no debunker or government apologist can ever legitimately deny."