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I would imagine they would be able to feel the movement and sound of the waves which would tell them they were still afloat.

Maybe not exactly at that point, but the article said they could hear the rescue helicopters, but still had to wait more than a day in darkness to be rescued.

Noises are also very different above and below water - even when you’re in an air pocket. They knew they were still at the surface and trapped in a capsized vessel.

Still, rationally thinking, which is presuming a lot in the situation, I can't find any real advantage to the two tourists of having the dive guide not try.

Maybe they were just worried about his wellbeing.

There reason she gave was "Stay with us because they are going to come to get our bodies" so I think they were beyond worrying about anyone's wellbeing :( What a nightmare.

I read it as "They are going to come to get our bodies so there is a chance we'll make it out of here alive if we just wait".

That makes more sense than my interpretation!