I'm afraid to say this but that statement is stating the bleeding obvious.They had oxygen for 96 hours, the implosion occured during the first two hours of descent
According to the USNavy their equipment detected an implosion/explosion about two hours after the submersible left the mother ship. The Navy person who disclosed this will no doubt see his naval career prospects of promotion come to a full stop, as this particularily sensitive listening equipment was still on the secrets list.
Much as I read your posts with interest, the person you are talking about Mr Cameron has stated on BBC/ITV and other news channels that he knew an implosion had occured on the Sunday morning during the descent as soon as all immediate communication was lost and the wreckage was found where he expected it to be found about 1000/1600 metres ahead of the bow of the Titanic, as that is the normal procedure landing spot for all dives so that they do not become entangled in the wreckage