I'm kinda concerned that they don't give any server selfhosting instructions. And the F-Droid page warns:
NonFreeComp (the application includes non-free components): The app contains libraries of Google Mobile Services, Play Services, Firebase, Google Maps.
NonFreeNet (this application promotes/depends a non-Free network service): The app connects to Google servers (Play Services, Firebase (cloud messaging), Google Maps).
I meant that the DPI can easily detect the fact that the connection is indeed Wireguard or OpenVPN.