Why the Archimedes' principle is not valid in case of an elevator accelerating upwards but it is valid for a car accelerating on a level road?

In the case of the elevator accelerating upwards, the entire elevator, including the fluid inside it, is accelerating upwards. This means the buoyant force acting on the fluid is also accelerating upwards, leading to inaccuracies in applying Archimedes' principle. However, in the case of a car accelerating on a level road, the acceleration is not affecting the surrounding fluid, so Archimedes' principle holds true.