What else do I need to provide to delete credits?

I recently submitted a contribution to delete some acting credits from a film that were incorrect: https://contribute.imdb.com/contribution/260421-154251-983000/

I provided this comment:

This is a documentary about rally in Chicago. Someone mistakenly added a bunch of Filipino actors to the cast list on IMDb. They are not in this film. https://collections.chicagofilmarchives.org/Detail/objects/23710

I got this response back:

Your contribution has been declined. We have been unable to verify your contribution.Unfortunately, we were unable to accept your submission as we were unable to verify the information provided.If your submission was placed via the IMDb.com Desktop title or name page submission form, you now have an option to provide evidence with your additions, as well as corrections or deletions. Please go to your Contribution History, re-load the submission reference and tick the box “provide an explanation to assist in processing this submission” and “check these updates”. The field will become available in the submission form. Please include evidence, or provide a URL which contains supporting evidence within this field.

I provided an explanation including a link to watch the film streaming. What else do I need to provide to verify that these actors should be deleted?