How to delete a single credit?

30 years ago, I was on a music video crew of an artist who was later convicted of major felonies and is currently in federal prison. In retirement, I volunteer in a "Music in the Schools" program and do not want to be associated with a known felon. My request to delete this credit was denied. I resubmitted my request with a screenshot upload of this artist's official conviction. Is there something else I need to do? It feels like this denial was done mechanically without human involvement.