We are not going to use Special:Newsletter/id/delete anymore, and sticking on to the 'Delete' option from the main newsletter page (Top right, More -> Delete).
The task would involve:
- Removing the 'Delete' from the subtitles in Special:Newsletter/id/actions
- Removing the form and other stuff from the codebase.
Splitting it into two tasks, to make it easier for a GCI task.