Doesn't have to mean it was deleted by the mods, IIRC, mods would mark reports as good if an action has bee taken before they checked it. So if they got your report and on looking up the post it was already deleted by another mod or the OP (which was what you requested), they would assume it was a good report and mark it as good, rather than leaving it unhandled.

I have once mistakenly reported a post to be moved to a certain section which it was already in at the time of making the report and it was marked as good.