I did a site:reddit.com search using my username and found ~50 comments that Reddit has undeleted but also hide from my own account. I could still edit and delete them.
Perhaps you should re-read the post, and/or the comments here. The posts referenced are still live on Reddit, hence they can still be edited - OP is not talking about a cached view from the search engine.
They do care. They're trying to find a way to stop it. That's the point of the article. It's the first sentence: