It uses Wireguard, sure, but it's using a coordination service to give you a effectively a flat network mesh instead of hub and spoke.

No it's not the same as normal wireguard with some 'just works' config sauce. Devices can connect directly and also find the best way to do it. For example two devices in the same office will create a direct path between them without having to go through the off-site vpn server.

At this mesh vpn is really good.

I know it's not just wireguard. That's why I said it's 'functionally' just a VPN. For the average user, it provides VPN-like functionality