Khrushchev after putsch murdered all of Beria people and went as far in his lying speech as to rehabilitate Yezhov, because Khrushchev himself was one of the most involved in yezhovshchina (and also changed the front 180 after Yezhov was exposed and arrested). Note that what originally prompted Furr to investigate Khrushchev speech were his blatant lies not even about Stalin, but about Beria. The source of worst things about Beria is Simon Montefiore, one of the worst anticommunist liars in existence, and accusing socialist leaders of rape, pedophilia etc is his standard modus operandi.

In short: basically every accusation thrown at Beria was fake (and often projection) so this one is most likely fake too. And Beria isn't even getting attacked because Beria but because Stalin.