The proof is found in Brian's book, not on the website that this individual has written to summarize it. You must buy Brian's book in order to see his computations. They are wrong because they present an incorrect physical model.

It is obvious that various governments have at times acted in secret and concealed their actions from their citizens or others. However they do not uniformly do so. Governments act overtly in some cases and covertly in others. Therefore the fact that some covert activity exists cannot be used as proof that some other activity is covert. For example, if it were suddenly proved that the U.S. government had conspired to murder President Kennedy, this would not be proof that it also conspired to falsify the moon landings.

When no presumption of overtness or covertness is tenable, each case must be individually established on its own evidentiary merits independently of each other case.