The USA only target 1000 calories per day for airlifted populations in post war Germany. The CNN article lists 1400 as the low calories intake. So Gaza is still 400 calories a day above 'doing it the right way' post war German reconstruction numbers for hard to reach areas.
According to the article 1400 calories are the number people are actually consuming, not unavailable to them. It is in the CNN article all this discussion is about.