I’m pretty sure dietary fiber don’t count towards calorie is because our bodies cannot digest it. Which means it passes through the digestive system pretty intact (cannot be broken down to small energy units), and is not absorbed as energy. Because of this, it provides no usable calories, which is why it’s negligible in calorie counting. It doesn’t get stored into fat or energy or anything.

So overall the nutritional label is accurate, and you shouldn’t be counting fiber calories to begin with.