When a publisher refuses to remove a negative post, you aren't out of options....

https://wiki-mixer.win/index.php/Is_Suppression_Permanent%3F_The_Truth_About_Negative_Search_Results_and_Ranking_Volatility

When a publisher refuses to remove a negative post, you aren't out of options. You can often mitigate the damage by requesting a snippet refresh to update the preview text or using the Remove Outdated Content tool if the source made minor edits