"Object only found in target system" - Disable is deprecated

Hi gang.

As of 9.2.1 this event is now deprecated in the sync projects.
How do you handle a "delete" for users only found in the target system but not One Idenitty. We are not willing to import / insert users only found in the target system as we want to be "master".
How can you use the conditions in the workflow to delete or disable these users?

I've tried using our "removelastrgroup" event for this (this event reads all groups and removes the last group from the array and passes it in the Powershell conntector), with the condition "Base.Username <> Other.Username" when importing users from target system to OneIM, however this doesn't seem to do the trick. Am I missing something ? Maybe it isn't that easy after all ?