Whilst I love the spirit of this article from your quotes, and Gascogne is indeed one of the top culinary regions in France ...
Gascony is ... more deeply French
erm, no, its particular identity comes among other things from being somewhat less French than the rest of France. The Gascons have always been fiercely independent, as perhaps most famously illustrated in the Three Musketeers and its first sequel, by Alexandre Dumas. They remain so today, and it is a great part of both their charm but also their aloofness and occasional lack of depth in relationships.
Also, neither the regional cuisine of Provence nor the Gascogne is particularly "sophisticated" -- it's rural rather -- nor is that of Gascogne more rooted in the land than that of Provence, with the caveat that Provence is more touristified (as the article explains) so that the genuine cuisine of the terroir is somewhat harder to find. Also, as far as cuisine is concerned, from a French point of view the Gascogne belongs to the broad category of Provençal cooking, including when the health benefits of the food of the South of France are mentioned. Historically, Gascony both has and has not belonged to Provence, though it was certainly part of the old Provincia Romana. It is not viewed as part of Provence today, though the links both cultural and historical are not denied.
It's a lovely article -- and the world that it describes, outside the particular locations, is the one typical of most of the Camino Ways from the Gironde valley and south, and from around Carcassone to the west. The cuisine described extends into the Landes, although the coastal Landes and the Pays Basque have different traditions, and the Gironde/Garonne valley has a mixed cuisine where the traditions of Gascony and those of the Bordelais compete, coexist, and combine.