Part of the answer lies in this bag of chips. This came from sea-level environment and in Park City it was about to burst.
I think the widespread breakage could be contributed to three things. Deteriorating sealant. Pressure loss or pressure drop in one of the panes and the altitude air pressure differential causing expansion , compounded expansion from heat and possibly frame or structural twisting...
Your snack bag is not vacuum packed, but it is sealed. Not a valid analogy.
I do not see the logic of pressure loss. Pressure differential does not cause expansion of window glass or the surrounding frame.
The window has 14.7 psi pushing on the outside and zero psi on the vacuum side. All the time. At altitude, the outside pressure is less (10-11 psi in the high mountains). Therefore, even less stress than at sea level.
If the vacuum seal fails, there will be less stress because the pressure will be equalized on the inside and outside.
Plus, if the vacuum seal failed, you'd see condensation inside the window, because moist air would enter.
I don't know the composition of the window glass. I assume it is tempered, which can withstand thousands of psi. Change of atmospheric pressure with altitude is trivial.
The triple pane window is a single unit. Not hard to replace, but a PITA because of all the cleaning of old adhesive, surface prep, precision locating of the replacement glass.
