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According to a report by Reuters, citing Chinese oil executives on the matter

For some background, China is Iran’s biggest oil customer and it looks like that is not going to change in the near-term as US sanctions start nearing. Chinese oil companies are starting to shift their cargoes from their own vessels to those owned by National Iranian Tanker Co (“NITC”) to keep the oil supply flowing, according to a Reuters report.
The idea here is to circumvent the sanctions applied by the US on companies dealing with Iran so instead NITC will have to shoulder more responsibility in order to keep the “business dealings” going. I reckon this means that NITC will be shipping the oil to Chinese shores but its customers’ information will be safeguarded in that respect. It is the same thing that happened in the past before the sanctions on Iran were lifted in 2016.