SAK-19952 introduced softly deleted sites. However when a site has been softly deleted, it disappears from view. An additional feature is to be able to list these sites in the Worksite Setup tool and was included as a screenshot (copied here).
I believe Oxford have this patch. Further, I believe
KNL-974 committed the backing support for this, so we just need the site-manage front end for it.
Matthew, can you supply it?