While your usage is common, it is completely wrong. A "conspiracy theory" is simply a "theory" that posits a "conspiracy". What you describe is the opposite -

While your usage is common, it is completely wrong. A "conspiracy theory" is simply a "theory" that posits a "conspiracy". What you describe is the opposite - when the evidence is so overwhelming, that the secrecy of the conspiracy can no longer be maintained. Room 641A was discovered in 2006 FFS. The reluctance of the press to acknowledge it has much more to do with propaganda, confused nationalism, concentrated press ownership, social/financial/legal influence from the military, and willful blindness. The idea that "conspiracy theory"===false comes right out of COINTELPRO. You know, the big secret (at the time) conspiracy to subvert domestic US movements. In fact, much of the 20th C was defined by secret conspiracies - the Bolshevik revolution, the rise of the Nazis, every post-colonial coup, etc. Project Echelon was well understood in the 80s. What is the USS Jimmy Carter even for?