Whilst I am not doubting the events, i am doubting the video. When I watched it, I felt as though it was a staged video to recreate the dive. I know many, many videographers, yet not one records the readings on his/her computer routinely.
The second thing that worries me enormously is the decision to dump all their buoyancy. If he had lost hold of one of the divers, he would have likely been negative, and would not have had any gas left to resurface. The rescuer and the other diver would have been buoyant, at the surface, and facing a ride in the pot. Surely they were in a position to be able to dump on the way up. Even if they weren't. losing control of their ascent would have left them maybe bent at the surface, but at least there is a breathable gas there, and the potential for full recovery.
The two divers were not in a great situation, to say the least. and well done for getting them out of a hole. I hope they bought copious beers afterwards!