In this case they're re-exposing the server(s) to the public internet, but their actual IP Address is still very much hidden behind the Wireguard connection to

In this case they're re-exposing the server(s) to the public internet, but their actual IP Address is still very much hidden behind the Wireguard connection to the VPS. The IPs they're talking about exposing are ones which are on a VPS, not their home router, or the internal IPs identifying a device in Wireguard.