> Let's say the external IP address you're going to use for that machine is 321.985.520.309 and the wireguard address of your local system is 867.420.696.005.

What is going on here with these addresses? I'm used to seeing stuff like this in movies – where it always destroys my immersion because now I have to think about the clueless person who did the computer visuals – but surely this author knows about IPv4 addresses?