Not sure, but they might be talking about this: fill a bucket with water and swing it upside down over your head. The water stays in the bucket because centrifu

Not sure, but they might be talking about this: fill a bucket with water and swing it upside down over your head. The water stays in the bucket because centrifugal forces apparently push the water outwards. The same may have happened for the fuel, I guess lowering the pressure? I know nothing about rockets.