Dead or on the lamb?

[ArMaP]

it's also known as "Asphyxiation".  In other words...lack of oxygen leading to death.  "DRY DROWNING" is some fantasy term come up with by Italian investigators.

All Italian sites I saw talk about drowning or asphyxiation, so I don't think it's "some fantasy term come up with by Italian investigators"

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- Ship should have 7 or 8 lifeboats, but only one was deployed.

We don't know that, we only know that only one was used.

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So, this guy was in a small, very small, cabin for three days trapped in an air pocket and was still alive, but Lynch and friends were in much larger cabins and died due to lack of oxygen in less than a day?

I remember that case.
In this case, we don't know the size of the hypothetical air pocket, but it was used, supposedly, by four people instead of one, so the time would have be reduced to 25%.
Another thing that makes a big difference is temperature. In the case you mention, the man was very, very cold, which slows down the metabolism, so if he kept calm he could use much less oxygen than he would at higher temperatures.
In the case of the Bayesian, one of the sources I saw stated that a meteorologist said that water temperature on that area reached 30º C, so the air would have much less oxygen.

Were Lynch and friends gassed before the boat went down?

That was my first thought.