I think there's some middle ground to be found, but it requires prejudice to be left at the door.
I don't think anyone would deny that cheap recipes and suggestions can only be a good thing. There is no denying that in some cases a poor diet is the result of a lack of education about food, not just what to cook but where to buy it from, how to cook it and how to do that consistently over time on a budget.
However, in other cases, no amount of frugality and clever ideas will help. For a woman with two children who has just left her abusive partner and is moving into accommodation where she literally has just the clothes on her back, many of these recipes are unsustainable because she doesn't have a cooker, fridge, freezer or the pans/utensils to cook with. There used to be a grant for people in this situation. It's been scrapped as part of the austerity measures.
For a single person living in B&B. Again, s/he'll have access to a microwave and a kettle. A fridge if very, very lucky. You can't cook a proper meal, much less store ingredients or freeze leftovers.
If you have a family of four, well-established in their home with no need to buy pans etc, you'll still struggle if you only have £25 to feed them on for that week. No amount of cheap recipes is going to solve that because it simply isn't enough money.
Why have they only got £25? Well, perhaps they have a bedroom tax to pay because when they were housed the authority gave them a three-bed house because that's all they had available, but because their two children are same sex, it's now considered superfluous to their requirements, but they can't find a two-bed property in their area because everyone is after those. They could move - at considerable cost - but that would mean changing the DC's schools, leaving Granny (who needs looking after), etc.
Perhaps both children needed shoes in the same month. Perhaps it was a cold winter. Perhaps the washing machine broke down and needed replacing (with a £50 second-hand one, but that's still a massive chunk of the monthly food bill). There are a whole multitude of reasons and the longer you live in poverty, the more frequent they become. Sometimes, when you can't afford toilet paper to wipe your arse on, splashing your last £1.50 on some cheesy chips to feel, just for a few minutes, that life can be enjoyable, is the only thing standing between you and suicide.
Sometimes, there just isn't enough money to feed people properly. Selling your TV can provide only the most temporary of solutions.