As a former member of the Reagan administration Roberts knows how the US government works. In this article he knows that the CIA functions to hide secrets from Americans and from the rest of the government. There are at least 15 other such government agencies, but I think that the CIA has played and is playing a key role in serving the ruling capitalist class in general, and the 9/11 project in particular. Given his knowledge about how these secret government agencies work, Roberts is very suspicious of the new revelations about the role the Saudi government played in the project.
The evidence of Saudi financing is what restores the credibility of the original story. Nothing changes in the story of the collapse of the three WTC buildings, the attack on the Pentagon, and the crashed airliner in Pennsylvania. American anger is now directed at the Saudis for financing the successful attacks.
To hype the Saudi story is to support the official story.