Disable Site Delete plugin only allows network administrators to delete a blog/site on a WordPress Multisite network. It does not allow blog owners to delete their blogs.
It works by doing that in 3 steps:-
- Removes the delete Site link from tools menu for non network admins
- Breaks out of wpmu_delete_blog function to avoid deletion of blog
- hacks around option to avoid sending the delete confirmation mail to blog owner
Need more details, please visit this post on BuddyDev
