To clarify, the delete is not "permanent". Or rather, what I meant is that the delete can be undone by asking an admin to undelete it for you.
That is to say, "delete" only hides it from view to all but admins, and the project's name remains used up. To reuse the same project name, an admin will have to rename your project for you so the name becomes usable again.
If you want to know who admins are, just click "Authors" at the very top of this forum page, names in Blue are admins, green are normal members.