I'm not sure I understand. Are these sites paying with cryptocurrencies or is the content delivery based on blockchains? The article is a bit vague about this.
Only the payment is via cryptocurrency. The content delivery is as centralized as ever, so this does not change anything wrt to "privacy concerns, censorship".
Both
"Because of the decentralized nature of IPFS and the STEEM blockchain, D.Tube is not able to censor videos, nor enforce guidelines. Only the users can censor it, through the power of their upvotes and downvotes."
You are probably right, their wording is pretty confusing, with that part : "[...]and the STEEM blockchain"