I can confirm this, I had now the chance to test it as well. My findings:

- Works just fine on an Intel Mac (tested one with Intel UHD 630). - Works well with Big Sur (tested on an Intel Mac). - Does seem to provide headless macs with a HiDPI virtual display with customizable resolution (tested via Screen Sharing, resolution switch on the fly worked, all resolutions are available without any real display connected - should work with VNC as well, but I did not test that).

Amazing, thanks for the report! Did not have a chance to test it on Intel but I did compile the app to be Intel and Big Sur+ compatible and the APIs used by the app should be available on these platforms as well.