Albatross, I have seen this document quoted a number of times and as HC highlights, it does not limit itself to controlled ditchings in reaching the supposed survival rates. I would go so far as to say the document is dangerous, as it does not present pilots with the true risks associated with a controlled landing on water.
I have always wondered if the Captain of the Cougar aircraft, who ignored the Land Immediately situation the aircraft was in, had seen this document and these statistics were part of his decision making process?
A quick aside - HC, the S92 RFM I was referencing for my earlier response was dated November 2005, obviously an amendment after the incident you are referring to.