The only person making this claim was extreme Leftist Syemore Hersh in the New Yorker. NO other source came forward with to verify this absurd claim. It is pure make believe. Typical Leftist propaganda tactic. One of them screams a lie and the rest merely repeat their lie as if it were fact.
That's because,
"Those who know don't talk, and those who talk don't know."
(former tag line)