when there is no access to any electronic means of communication, how far will your bitcoin wallet take you when nobody will want to take the chance that you wallet might have become depleted and not updated via the blockchain? Not to mention that your electronic devices could well be "bricked" and you can't get any access to anything anyway. Gold and silver have always been currency and will still be currency when man's hubris is exposed.
I wasn't able to see Musk's holdings on that list. Why would he not be there?