krillmat just clicked on your supplied link.
'Universal Android Debloater GUI
DISCLAIMER: Use at your own risk. I am not responsible for anything that could happen to your phone.'
that was the first thing I read.
'This software is still in an early stage of development. Check out the issues, and feel free to contribute!'
that was the second disclaimer.
so you just proved me right, once I use this and get myself into grief, work out how to extricate, myself from the mess and go back to the GrapheneOS installer web page, then do it properly I guess using ADB will be more of an effort.