Doesn't the refining process make percentages of both products from crude oil? Are you suggesting they will produce diesel but do something else with the gasoline fraction?
The refining process does produce a certain amount of the lighter fractions, but my understanding is that the heavier fractions (diesel) can be prioritized in the process, depending on the feedstock. But I am an electrical engineer, not a petroleum engineer. Plus, they may be making gasoline, but not transporting it to where people can get it. Diesel is also easier to store long term.