The delete in moderation is a soft-delete. It does not actually delete anything, just hides it from public. This is consistent with the delete in moderation for posts, threads, etc in XenForo.
In order to physically remove the page, you must use the inline moderation controls on that page or on the area that contains that page. This is also consistent with XenForo: for posts, threads, etc, there is also no full-removal option via the moderation queue.