If this is true, it has to be as a result of the caps.
Vacuum tubes form the 20’s and 30’s routinely work, which they could not do if their vacuums went to air, and there’s a helluva lot more pressure differential on a vacuum tube than on a bottle of soda at atmospheric pressure.
That is not true. The pressure differential of a vacuum tube is 15 PSI at sea level. Soda is pressurized at 55 to 100 PSI.