Oh, and also -- I think the comment is still on the blockchain, just that it now appears "deleted" when viewing it via the website.
Hmm, I wonder if I can put a URL together to get to that comment?
After quite a bit of trying, I give up.
I also searched for "delete a post on steemit" and there were many discussions, and a feature request, but I didn't see how to do it.
https://steemit.com/steem/@jsc/steemit-delete-proposal
https://github.com/steemit/condenser/issues/20
I know it's possible, as https://steemd.com/@shuwix shows it was done, currently the eighth entry.
Aha! Finally got steemdb to show me something -- but all it shows is empty. Perhaps he posted an empty comment, then deleted it? Here's the link: https://steemdb.com/influence/@shuwix/re-libertyteeth-re-shuwix-re-libertyteeth-re-shuwix-re-jerrybanfield-secrets-of-influence-start-with-skills-20170827t064057882z/edits