Truckers that refill stations use physical sticks to measure tanks, there is already a robust analog solution. This is a nothing burger sent by our hawkish US government looking to further villainize Iran.
I would guess the delivery driver dips the tank as a failsafe, because spilling fuel is a Big Deal - whether it's an overflow or perhaps even just filling a tank that is leaking.
(I do agree with GP's point about the administration's need to villainize Iran to maintain whatever support they can for the Epstein war though)