I was happy to see a Pie OmniROM for the G5 Plus, as I was using vache's 8.1 OmniROM on this device for all of the last year as my daily driver. Thanks, vache!!
I did a clean install of this 9.0 version yesterday with fresh pico GApps, and then restored my apps/settings from a Nandroid backup. I really like the ROM, so far. One of two issues I'm seeing now are the fingertip scanner and associated options in the Security settings are gone. There isn't any way to reset the fingerprints, or make that an option to unlock the device. Strangely, the Pie "Lockdown" button can be added to power options, which removes biometrics, but I can't figure out how to add biometrics to the phone (i.e. fingerprint unlock). I'm using a passcode to unlock the phone, so not a huge deal.
The second issue is on reboot, the ROM took a very long time to detect the SD card (several minutes). Once it found the SD card, the ROM has been performing very well.
I'll second the other user who has been asking about encryption. I once tried to encrypt this same phone using the 8.1 OmniROM, and it bricked the device.
Thanks again for the great looking/performing 9.0 potter build.