Warren Platts getting a Nobel prize could happen, the Nobel prize commitee only needs to agree to make a practical bad joke. Unjustified - yes, absurd -yes, impossible not a bit.
IIRC string theory predicts something like 11 dimensions not five.
But the mbh gobbling mass up to 1 kg in a fraction of a second is a new dimension of absurdity with nothing to back up other than wild speculation.