Actually I think this is the correct situation:
If the user has created the launchd file through the System Prefs sharing panel, than you'll need sudo to rm it. But if it's disabled in System Prefs, than yes, you can run the command as admin only, as you have write access to the Preferences folder.

In short, you have write access to the folder as an admin but not to the file created by the System Pref.

Great tip by the way!

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