Hello. It seems the reason that the redlink notice still exists is because the link is still hyperlinked to the removed comment.
In other words, you likely need to restore the comment and edit the comment to unlink the deleted page, so the word isn't red anymore.
Use CTRL + F to search "removed" for the redlinks you're looking for, and see how that works out for What Links Here. If you can't view them due to lacking rights, then import this script and give it a shot.