Just a note, while wireguard makes its own VPN tunnel, it differs slightly in that it isn't the typical VPN server with vpn connecting clients, it is more akin to a peer network. Each peer device gets it's own "server" and "client" config section in the setup file. And you share the public keys between each peer before hand, and set the IPs to use.
Wireguard IS a VPN. He has somehow through his challenges of exposing services to the internet, exposed wireguard from his home to the internet for him to connect to. Then he can connect to his internal services from there.
It's honestly the best option and how I operate as well. I only have a handful of items exposed and even those flow through a DMZ proxy before hitting their destination servers.
VPN’s are neat, besides the fact they’re capable of masking your IP & DNS they’re also capable of providing resources to devices outside a network.
A good example is the server at my work is only accessible on my works network, to access the server remotely without exposing it directly to the internet would be to use a VPN tunnel.