Double crossed?

I was reading an article on the net and want to share it with you guys. Apparently in the SR, Mandana will be shown clips of other HMs and told to nominate two people who she would like to get evicted. She will do that. However as soon as she enters the house, Bb will declare those two as immune from eviction. Double Trouble BB will Turn double crosser. This is from a news site so I am presuming it to be true. Please excuse me if this turns out to be untrue.