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.
However, I don't push my breathhold to extremes. So probably not as problematic as it might seem. Now that I know there is an actual named technique and process, it is something I can work on I suppose.