Maybe it’s better idea to check some simple physics and biological facts before throwing insults.

Do you realize how much volume is it that would weight 21 grams? I didn’t calculate precisely but my rough idea would be probably 5 gallons or 20 liters!

Do you think that one breath of air is comparable to 20 liters?

Do you think each breath takes in or out 21 grams of air?

Do you think that there is so much pressure that when this pressure is released that the volume of the released air (and other gasses) would be equivalent of 20 liters?

Besides the pressure is not the same as the volume of breath in and breath out because part of that is still not the inside pressure.

Also the measurement says that the jump happened instantly. Body pressure doesn’t jump instantly.

While I’m very skeptical myself about those measurements and the value that was measured, and the methods involved, just throwing insults without maybe checking out a fact or two - would actually help you to uphold your own reputation.