I get the idea as I used to do this too. Having secure & different passwords everywhere is just the basic way to go. As such I dont think though its a good idea to put a system in your passwords. Hacking attempts are automated and getting smarter every day. Its only a matter of time until someone unleashes an AI to look for patterns and you are toast.
I recommend to juse a decent password manager that generates them for you and as much MFA as possible.
He just makes it sound like these other countries are not remembering the efforts from all the allies, including the U.S. I can tell you first hand that is not the case. I think any US WWII veteran can confirm.