The article describes what to do in situation when VCD is not able to automatically generate guest customization packages. The provided command basically generates "unix_deployment_package.tar.gz". VCD is supposed to run this command internally, but if it fails for some reason - you can run it manually to fix the situation. Once the package is generated, it will be used going forward (cached).
The article is also a bit incomplete, because there are two other packages: windows_deployment_package_sysprep.cab and windows_deployment_package_sidgen.cab. windows_deployment_package_sysprep.cab is never generated by VCD itself. To get one, you need to follow VCD Install Guide. windows_deployment_package_sidgen.cab can be generated using:
$VCLOUD_HOME/deploymentPackageCreator/deploymentPackageCreator $VCLOUD_HOME/guestcustomization/windows $VCLOUD_HOME/guestcustomization/windows_deployment_package_sidgen.cab "customize-guest.exe" 1
Also all files under guestcustomization folder should have proper permissions (normally vcloud:vcloud, not "root"). So, if you generate them manually, it's a good idea to run "chown -R vcloud:vcloud $VCLOUD_HOME/guestcustomization" at the end.
/Andrii