Andrew,
Typical journalism and with the usual shallowness. I use that term, because most journalism is based on quick punchy stuff, that doesn't go deep, because the general readership, now a days, has a bad attention span. Being a journalist myself, I know the score: not really enough time to do proper research and then the subs just cut it to pieces.
Someone mentioned the "vile duke" and his treatment of Carcassonne. Often wondered why the walls of Avignon look so well preserved? Say no more! He had an acolyte by the name of Paul Abadie, who demolished and rebuilt the cathedrals of Angoulême and Périgueux. His crowning masterpiece is the white monstrosity in Paris.
As to food in the south/ south east. Quite a few writers have disparaged the cuisine of the south, especially that of Provence. One should read Ford Maddox Ford on the subject. Regional food can be quite limiting, e.g. in this area the most famous are Confit de canard and fois grass, but one gets a bit bored after a while, so other things are found.
Most expats seem to think that what they see on the endless cooking programs on brit telly, is what the french actually eat, day to day. There are two grades of cooking in la France Profonde: household (day to day) and restaurant "dinner". The routiers supply home day to day cooking, though in some cases it can be quite stunning. I once had lunch in a routier near to Bergerac, on the Bordeaux road. The place was full of workers and most of them had chosen steak tatare as their entré: remember Mr. bean? (lunch €11 4 plats)
Restaurant dinner menus have more refined dishes on offer, because to eat a dinner in a restaurant, the clients are expecting something more sophisticated than pot au feu, or boudin noir.
Marie-Elisabeth, my french co presenter, read a couple of years ago that moule frite was now the most popular dish in France: it is belgian.
Since being here, I eat "french" and don't yearn for the brit prole food.
Besides suffering from the Vile Duke, the Isle de France king Louis and his bands of thugs, some english, did the most harm to the south, especially when they destroyed the Langue d'oc, though having said that, around here Dordogne/ Sud Charente, a lot of people still speak it.