Gosh it's almost like the tube would have to be sealed to achieve a vacuum...

If you read a little further down the page that you yourself linked to, you’ll notice this: “In addition to losing mass, the following significant changes from baseline measurements were reported in the post-diet assessment period: a 15% decrease in absolute resting metabolic rate (1789.8 ± 80.2 kcal/24 hours,…

This is why you have to adjust your calories frequently to keep up with your lowering RMR. Apparently this small detail slipped by both the scientists and Beth.

This is incredibly misleading, you don’t need to burn 7000 to burn a pound of fat, your metabolism naturally slows as you lose weight because you have less weight to maintain.