It doesn't have any kind of censorship. All that this article is saying is that you have a blockchain which runs on nodes and you have websites such as steemit.com , busy.org and others. This websites could potentially hide some content which is out there in the blockchain. Since many people go with steemit.com it is somewhat how they can censor you but they shouldn't do that - problem here is that we have to trust the website with our content and steem account.