This answer by JohnGB on "Greyed-Out vs Invisible" by Joel B kind of touches on the idea, but this question focuses specifically on a moderation tool for power users.
Should buttons that don't apply (e.g. voting to delete a post that's already deleted) be greyed out or completely removed? The screenshot shows the latter option.
On this page, everybody has basically the same level of access so I don't think the "don't show greyed out mod tools to non-mods" principal applies. All the options possible should be clear since they probably all show up on at leas one item on the page (which would have many items).
I think removing them would be better since it would be cleaner and I don't think options that aren't relevant would help with applying the tools right. But leaving all the options in all the time would be more consistent. Should buttons always be there but sometimes greyed out, or should they be removed?