My comments on the US DoS are on what they have achieved, and how they have achieved it, not its public face. I also have some problems with his politics and policy recommendations, which I find a shade extreme, but Richard Pipes is one of the finest historians of the century. One of the great travesties of this century is that Western intellectual elites averted their eyes while crimes of extraordinary magnitude were being committed in the Soviet Union during the first half of the century. The phenomenon of denial and bizarre apologetics seems to have repeated itself in the latter half of the century in regard to China. This branch of history is now in the process of being opened up and studied.
Many important revelations are on the way.
A myriad of forged documents, partial forgeries, and propaganda could come between the event and the documents. You must prove that the 1989 document is genuine and unaltered. Since we know that forgery and propaganda are SOP for the CIA and probably the Chi Nats and the PRC we must consider this possibility. Prove this not to be the case. That is not a convincing source.