Instead of talking rubbish, the "Yogi Maharaj" should have said, "I don't know."
'Buoyancy' stuff is absolute nonsense and so much else is ridiculous. He thinks that bigger animals or trees have much bigger cells. Does he know that a chicken egg is a huge single cell and that the 1.5 kg ostrich egg is the largest known existing single cell?
"Let us respect the dead since they have the experience we do not have."
- Dr John Hunter
The Qur'an gives us an infinitely better explanation of life and death by comparing it with sleep phenomenon.