I think there's an element of truth to some of what he's said, but it's like a stopped clock telling the right time rather than a deep insight. I can't imagine that having messages couriered everywhere by hand will be a practical way for the US government to function unless this is part of his plan to get people back to work?
I thought the same about large organisations until last week I saw a ward-sister with a transit envelope, one of those manila pockets on which you write the next destination and send it on through internal post.
Apparently they're still widely used within the UK National Health Service to send confidential paper records and other data-conveying objects.