For future reference - the "Create Package" option creates an application that will allow you to perform an unattended installation on a CLEAN system.
If you've already installed AC19 and just drag the application into the trash and try to run the "package" again, the installer will not run.
So if you're testing this stuff on a build system - make sure to ALWAYS run the uninstaller first (ArchiCAD 19 > Uninstall.AC > uninstaller).
You can perform an unattended uninstall with this command:
/Applications/GRAPHISOFT/ArchiCAD\ 19/Uninstall.AC/uninstaller.app/Contents/MacOS/uninstaller -silent
... running that as root with sudo might even disable the authentication prompt (probably required to disable the Codemeter process), but please note - this will also reboot your computer without any confirmation (I learned that the hard way...).
So in conclusion - the "Create Package" option does work, albeit not quite how a Mac admin would expect. It's not a package in the traditional OS X sense and a user still has to be logged in to the system for it to run.