Hi Joachim,
I don’t want to say Yes definitively because the product hasn’t been released yet, so no one can say for sure.
What we do know is that the Pi3 + Roon Bridge works as a WiFi endpoint and I can’t see any reason why this HAT would change that.
I put my money down, but don’t want to tell others they can safely do the same until it ships and early users confirm it works.
This might be excessively cautious, but I do have an original Ring mouldering in a drawer.