Paul Haynes writes in
his paper "Increasing the probability of surviving loss of consciousness underwater when using a rebreather" that "Alternatively it is conceivable that under certain circumstances, the distressed diver may regain consciousness, potentially enabling self-rescue."
The paper states at the bottom, "Paul Haynes is a military and sport diving mixed-gas closed circuit rebreather Instructor Trainer with a 25-year military, occupational and technical diving background."
So, evidently not everyone agrees with DANSA that "One could even say that the loss of consciousness underwater (LOCU) equals death, unless the person is very lucky indeed."