The article also excludes the cost of electricity/gas to power the stove/microwave, the cost of water to cook e.g. pasta and clean the pans after, the cost of the pans amortized over your meals, the cost of plates and utensils...
If someone else is paying utilities (say, your local university, or your landlord), and you already own kitchen equipment (say, hand-me-downs from your mum) perhaps this is a reasonable assumption. But for those who are actually in poverty, the upfront capital cost of cooking tools and the hidden costs of energy in cooking might be prohibitively expensive.
That said, cooking in bulk is indeed cheaper. So if you're trying to conserve, it might help to find two or three good friends and cook your meals together.
If someone else is paying utilities (say, your local university, or your landlord), and you already own kitchen equipment (say, hand-me-downs from your mum) perhaps this is a reasonable assumption. But for those who are actually in poverty, the upfront capital cost of cooking tools and the hidden costs of energy in cooking might be prohibitively expensive.
That said, cooking in bulk is indeed cheaper. So if you're trying to conserve, it might help to find two or three good friends and cook your meals together.