Hope you can get this behind you soon. Just so you know, they can and do delete steem accounts, too. I doubt yours is in danger but I was pretty bummed when this happened: https://heavy.com/news/2019/01/the-dark-overlord-update-banned-steemit-twitter-reddit/

It also seems you can get it voluntarily deletted:
https://busy.org/@jlordc/the-first-steem-account-to-be-deleted-removed-from-steemit/amp

I thought the blockchain was "forever" but honestly, I cannot even find my own posts if they are more than 2 months old.