Monero is referred to as a zkp coin in this article; but afaik it is cryptonote based, using a combination of mixing and stealth-addresses and doesn't actually

Monero is referred to as a zkp coin in this article; but afaik it is cryptonote based, using a combination of mixing and stealth-addresses and doesn't actually use zero-knowledge proofs. Did that change at some point or was this said in error? I think this is still a fantastic article as an introduction to the concept, I hope it is not removed.