Hay Kaffphine,
I checked out your link to DAN. While I am a member and highly respect DAN I wonder if this isn't just one of those CYA things.
Think about this for just a second. Provided you stay well hydrated during the flight, and by that I mean water, stay away from the booze and snooze for awhile during a long flight. The cabin altitude, the altitude the inside of the plane is keep at by way of pressurization, is usually around 8,000 feet even if the outside altitude is say 41,000. If, lets say you take a 6 hour flight to an exotic dive resort, unless you live in some very high mountains this altitude is going to higher then where you started your trip. A higher altitude means less atmospheric pressure, less pressure means nitrogen off gassing. So theoretically you would have less nitrogen in your system from being at a higher altitude the first day you arrived then you would at anytime during your stay at the resort.
It sounds like they successfully avoided answering the question by baffling us with a little BS.
Scott