“Fixed fortifications are a monument to the stupidity of man. Anything built by man, can be destroyed by him.”
General George S. Patton.
I think another of the major flaws in their plans is they assume when at SHTF situation happens, will they be able to get to their Armageddon bunker.
Zuckerberg’s Bunker is in Hawaii, it might be impossible to get there in a real SHTF situation.
Having a bunker, bug out location, or some other place to get to in an emergency is a good idea but the location needs to be a reasonable distance that you could get to in a number of ways even if you have walk there.