You should probably reach out to whoever gave you a neutral review, but keep in mind that when you look closely at posts written by AI, you can find several sentences that clearly prove that this is plagiarism.
When the entire forum was checked for plagiarized posts in 2019, there were many banned accounts that were caught just copying a few words. Therefore, I do not think that your apology should completely erase from history the fact that you once deceived the forum. You won't get a ban, but it might be worth giving you some time to remove the AI link tag.
I think it's just an excuse if someone didn't notice if they get feedback from someone because there are many sections show feedback score. Moreover the feedback is shown in trusted feedback and it's already leaved since a month ago.
I believe he already know the neutral feedback and think it's not a problem since it will not ruin his account, my assumption his campaign manager ask him to erase the neutral feedback or he will get kicked from the campaign.