I'd suggest you do their course and find out or at least ask them directly before flaming them.
Secondly - I have seen course materials for 6 freedive courses and they all teach you to breath fully again(eg 3 stage inhale)......strictly speaking they all therefore teach hyperventilation to varying degrees
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Andy
Sydney, Australia
"Birds fly, when they get tired they land. Man thinks, when he gets tired he says 'I understand'" - Japanese proverb
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