adb shell settings get secure user_setup_complete
If it turns out to be 0, set the variable to 1 like this:
adb shell settings put secure user_setup_complete 1
Then reboot the phone and hope it stays off....
If that doesn't work I recommend a clean flash and make sure to complete the setup wizard.
Having installed this rom countless times for testing, I can say without a doubt that I've never had the setup wizard pop up again after completion.
fastboot flash vbmeta vbmeta.img --disable-verity --disable-verification