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I like this theory. Something I wondered about as well. The weighting safety advice everywhere on the internet says to go for the trim that places a the mouth just below the water on a passive exhale, which would be uhmm.. not very ideal in case of a blackout.But then again, free-floating uncountious body floats with face down, and in such case, it has been said before, by freedivers by the way, it is better to have a snorkel in and blow the pipe before you breach, so that you can restart breathing on the surface even when you have no memory of events.
Very interesting link. I like it, as it kind of supports what I already do, which is nice, although I question how easy it is to reliably release a small amount air just 30/20/10cm from the surface. I find that I am often a little early or a little late. So, in that case, end up having to either blow my snorkel to clear it at the surface, which is considered somewhat dangerous, or remove my snorkel from my mouth if my breath is short (not as risk-free as some might have you believe).Global Ascent Maneuver described by founder & inventor Gabriele Delbene and use of the snorkel in the ascent phase by international Championswww.apneapassion.com
It all depends on the situation. Understand the advantages and dangers of either method. Practice them properly so they become ingrained in your muscle memory and adapt to your situation.