To be fair, caloric measurement is always an approximation. No two servings will ever have the exact same number of calories. Even if they did, different gut biomes will also feed on those macronutrients to different extents. Couple that with everyone having different metabolic rates, and 2 calories is indistinguishable from a rounding error.

And the guidance from the FDA reinforces this. The reason this panel shows 0 instead of 2 is not because anyone screwed up or is trying to mislead; it's because any serving that provides less than 5 calories is supposed to be rounded to 0 per FDA regulation.

They have some of the best accessibility regulations in the world.

Yeah, unfortunately, if that's a US label, that is how the regulations work. The FDA allows rounding to the nearest five. However, if it's less than five, they allow you to round to 0.

(1) “Calories, total,” “Total calories,” or “Calories”: A statement of the caloric content per serving, expressed to the nearest 5-calorie increment up to and including 50 calories, and 10-calorie increment above 50 calories, except that amounts less than 5 calories may be expressed as zero. Energy content per serving may also be expressed in kilojoule units, added in parentheses immediately following the statement of the caloric content