Well, the original post (as in the image) is about locking yourself out of a remote server by changing a firewall rule, thus needing to drive to the server to access it locally.

By using wireguard to tunnel into the router, you can remotely enter the LAN, thus bypassing the firewall, as if you were accessing the server locally.

It let’s me remote into their LAN, thus bypassing the firewall

Well, I have my server running in my parents basement, because they have fiber, and I don’t.

It’s not quite a 500km drive, but still a long enough distance for this scenario to be a major inconvenience.

But since I have wireguard running on their router though this specific scenario is not something that could happen to me