MicrosoftBasically, the Registry Policy (registry.pol) file format, which is used to deliver the majority of Group Policy settings, is a sequence of registry commands. Most of the time the commands set a registry value, but they can also be used to create a key, delete a specific value, or delete all values from a particular key. That's what Policy Analyzer is reporting.
Those Excel sheets are almost certainly being exported using Policy Analyzer. The PDF that comes with Policy Analyzer describes the "delete" and "delete all values" entries:
Policy Viewer shows ***CONFLICT*** in a cell to indicate that the GPO set has multiple definitions for the
setting that are not all the same. It reports [[[delete]]] to indicate that the GPO includes a command to
delete the registry value if it exists, and [[[Delete all values]]] to indicate that the GPO includes a
command to delete all values within a key. Several GPOs that manage lists of settings will delete all
values within a key before setting the values in the list.
"[[[create key]]]" was inadvertently omitted from the documentation. It's just that the GPO includes a command to create the key but does not necessarily populate it.
Documentation about the Registry Policy file format: Registry Policy File Format | Microsoft Learn
