Deleted posts are accessible via the edit URLs, if you know the ID
e.g. https://meta.stackexchange.com/questions/89775/dummy-post-to-reference-in-bug-report
is available under https://meta.stackoverflow.com/posts/89775/edit
I spotted this with a post of mine that had been downvoted enough to earn 'peer pressure' on deletion; the original post is gone from my activity, but still accessible via edit... no idea if it works for other users posts.