I’m getting that; my unease is around the people in the link in the OP not consenting to being filmed. Offence isn’t an issue; privacy is and even if it’s within the rules of the web I’m not sure it’s what I want to see on a forum such as this. It feels... seedy.
That's how I felt plus the suggestion that it should not be watched with young children present - as if young kids would be interested in people walking around a supermarket anyway. I suppose they might be if the adult with them was exclaiming with shock horror, other than that I doubt they'd notice.
Regarding the clothes, I think we already made the point that a lot of people can't afford good clothes, they'll buy cheap stuff from market stalls which are not a good fit and soon go out of shape in the wash; better off people who are on the large side are able to buy quite smart clothes. Gok Wan (who was obese as a youngster) has been marvellous with his designs for larger women in the generally affordable TU range but even those are too expensive for many people, certainly for everyday wear - like for going shopping.
Cheap food is usually more fattening than more expensive & stretching the budget is very hard for some. I see plenty of that in my job & am full of admiration for the efforts made, I wouldn't think of criticising someone for their weight or their dress. People do what they can with what they have.
(StevenH I didn't realise there was snob value in shopping at Waitrose! Surely not, I shop where I happen to be regardless of the brand, love Lidl & Co-op, but Waitrose is near where I live. They have lots of special offers. I remember years ago people speaking about M&S in much the same way as in your links but that has died down in recent times. I suppose Waitrose has taken over. Seems silly, it's not Harrod's food hall.)