The definition is interesting, in that it refers to "official or prevailing" explanations, but the definition does NOT claim that official or prevailing explanations are the truth, only that they prevail.
Is there much question that the FBI and CIA work in secret to benefit themselves? If not the entire operation, certain groups within it. And it is a simple and agreed fact that the CIA and FBI work in secret. What is redacted?
The practice of hiding information for the purpose of protecting the appearance of integrity has fueled the organized propaganda press for decades.