These have tripled in cost in the last 5 years here. I can cook (enjoy it as well) and I think a lot of people commenting can as well. The issue is the tips you are giving don’t change the base cost of ingredients. Rice and beans for example have doubled in price here, flour went from $2 to $12, Veg of any sort has at least doubled and eggs are no longer cheap. This year they are calling for a drought and I don’t know if I will be able to grow as much veg in my garden.
The example in the “article” is a bit over $10 a day, that is not eating out or over spending. The only food still cheap is junk.