Ah okay, I see. Then I propose, as I already tried to propose in the AUR comments, to include hummingbird in optdepends, since on Arch Hummingbird is not shipped.
That's it pretty much. You can look in the Stats-Tab for the "VPN Type" which should state "Wireguard".
You also can confirm by activating the "Expert Mode" in Settings -> Advanced -> Expert Mode. Next you can connect to a server and you should see the extended verbose connection information. Those information should also be listed in the Eddie Logs.