I think this really mischaracterizes the modern poor, especially in developed countries. It's not uncommon to see poor families with things like recent model phones worth hundreds of dollars, designer clothing/shoes, and the like. In many ways these are the sort of traps that keep people in poverty. Or referencing this article itself, apparently they decided to go eat at McDonalds and managed to spend $20 on two coffees and one coke. I mean that'd break the budget of just about anybody outside of well into the upper edge of middle class.

And a pressure cooker is not a luxury, nor is it something that's outside anybody's price range. On Amazon it looks like they start around $20. And the whole point is that it takes basically 0 time, and saves a ton of money, and even time, relative to things like eating outside the house.