Earlier quoted context omitted.
If they used Oraclize (secured by TLSNotary), impossible to forge any data, it would be as authentic as Poloniex/Kraken's APIs say it is.
so it means trusting Poloniex/Kraken's API, so not decentralized and trustless.
Re: Etheropt, a decentralized options exchange built on Ethereum
#31it also means trusting TLSNotary