Not true.
If the conspiracy is ongoing, the statute of limitations begins when the crime is discoverd, not when it was committed.
Since the named individuals have been covering it up all this time, the tolling didn't begin until the documents were discovered and declassified.
-PJ
That's not my read on the statute. "...the statute of limitations is generally governed by the default federal rule found in 18 U.S.C. ยง 3282. Under this statute, the government must initiate prosecution within five years of the commission of the offense."