Actually there may be some truth to that, just look at Democracy Now!. The movie Mea Maxima Culpa: Silence In The House of God "uncovers documents from secret Vatican archives that portray the Pope as both responsible and helpless in the face of this abuse." Alex Gibney, director of the film stated that
Originally Posted by Grant
I think one of the most interesting things about Pope Benedict, the current pope—and there’s a lot about both him and the previous pope, John Paul, in this film—one of the most interesting things about him was, before he was pope, he was Cardinal Ratzinger, and he ran what was called the Congregation [for] the Doctrine [of] the Faith, formerly known as the Inquisition. After 2001, Cardinal Ratzinger got all sex abuse cases sent to his office. So Cardinal Ratzinger actually knows more about clerical sex abuse than any human being on the planet. And then he became pope. But it was while he was Cardinal Ratzinger that the case of Murphy was brought to the Congregation [for] the Doctrine of the Faith.
Interestingly enough, you know, instead of moving quickly to defrock him, they took pity on the priest himself, who wrote a very poignant letter saying, "Look, I’m an old guy now. This was so long ago. I’m so sorry. Please let me die as a priest." And that is the wish that was granted by the Vatican. And so there was no justice for the deaf victims.
So, there is some truth to the fact that the Pope does have knowledge that sexual abuse did occur.