What would you do if the Internet world shuts down for a whole week?

[Graybeard]

its theoretically possible

Well, the all-mighty Google isn't doing it

Set up DNSSEC security - Google Domains Help

To prevent threats like cache poison attacks and NDS spoofing, Domain Name System Security Extensions (DNSSEC) authenticates exchanges of information. Domain Name System (DNS) translates human-readab

support.google.com

They decline to do that for their own domain --maybe network issues ?

the US government is

NY Times doesn't either

How To Setup DNSSEC on an Authoritative BIND DNS Server | DigitalOcean

We all know that DNS is a protocol which resolves domain names to IP addresses, but how do we know the authenticity of the returned IP address? It is possibl…

www.digitalocean.com

If you are running your own Master DNS BIND9 you could.

But if your are not using DNSSEC that video is meaningless?