Let me tell you something you may not know, if you are given the mantle to judge yourself, you must surely have a dialogue to give justice to yourself even at your guilts. So in other words, a wrong doer would never know what they are doing is wrong not until it results to when the deeds is being justified.
So here Op, what happened in those posts was that the moderators attention was not called during when the posts were trending so at the awareness of the moderator was when justice was served by deleting posts not in lign with the topic of discussion or topic seemed off from the section board where it was posted.
So the poster (s) will never admit the post was off from the topic or board but the moderator will always find that out that which is off and do justice to it in just matter of time.