Calorie Question

There’s some gnocchi that I buy to make a big pasta bake but I wanted to double check the calories.

It says that this is 133kcal per 100g. A packet is 450g so I assume the whole packet is around 600kcal. Would this change at all with cooking? Gnocchi doesn’t absorb much water so I’ve assumed the calories won’t change much with cooking but is that true? It does seem very low for so much!