Change the domain from "www.reddit" to "reveddit" -- note that you have to remove the www. subdomain while you're at it. That will work if the post/comment was indexed before being removed, and only if it was removed by a mod or admin. Self-deleted stuff is gone forever.
I tried that one, but it was giving me some chud "THE COMMUNISTS ARE TRYING TO SHADOWBAN US" shit and asking for an API key that I was too lazy to bother with lol