The same reports in the UAE said the tankers had been on their way to the US after being loaded with Saudi oil.
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I don’t think we get much Saudi oil, so I doubt this story.
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About 8-10% of the oil we import comes from Saudi:
https://www.eia.gov/dnav/peT/PET_MOVE_IMPCUS_A2_NUS_EP00_IM0_MBBL_M.htm
Much has to do with the refineries. They are built and configured to accept petroleum feed stocks of a certain type. That can be changed, but it is an expensive and time consuming process, one where the refinery must go offline for many months sometimes.
Saudi Arabia has been a dependable supplier of light sweet crude for decades. Politics is politics, but this is business.