I don't think drowning is accurate......
If I understand the reasoning for not turning reptile eggs correctly, then drowning would not apply.
Reptile eggs develope attached to the inside of the egg. Blood vessels are connected to the inside wall. When the egg is rolled or turned durring development, the blood vessels can become tangled or twisted thus restricting blood flow.
I guess, restricted blood flow would result in oxygen deprevation and could cause death similar to drowning. But when I think of drowning, I think of oxygen being cut off by fluid in the lungs when breathing is required to absorb oxygen.
Just my .02