I have seen another band photo of Bono where as he is wearing two necklaces. One is the traditional cross, representing Christ. The other is upside down, but this represents the crucified Saint Peter. Who felt he was not worthy to die the same way as Jesus.
There was nothing satanic about this, until modern mid twentieth century culture, made it so. Many Catholic priest in centuries past, would also wear this type of cross, to honor the "First Pope." Peter, who built the church, which would later become Catholicism. The man in the video needs to do some more research, before he starts accusing Bono of Satanism.