WTF? I've never heard of any "U.S. Prosperity During WWII" myth, and the article gives no cite for any. Plenty of basic necessities were rationed - I've still got a bunch of my parents' leftover WWII ration coupons.
Here is another: "World War II had a profound and multifaceted impact on the American economy. Most obviously, it lifted the nation out of the Great Depression of the 1930s. As late as 1940, unemployment stood at 14.6 percent; by 1944 it was down to a remarkable 1.2 percent, and the gross national product (GNP) had more than doubled. But the wartime economic mobilization did more than end the Depression." https://www.encyclopedia.com/economics/encyclopedias-almanac....
And a third: "The U.S. entry into the war helped to get the nation's economy back on its feet following the depression. Although just ten years earlier, jobs were very difficult to come by, there were now jobs for nearly everyone who wanted one. With the creation of 17 million new jobs during the war, workers were afforded the opportunity to pay off old debts, as well as to begin saving some of their earnings." https://www.loc.gov/classroom-materials/united-states-histor...
Counterintuitive fact: in the UK, rationing improved nutrition. Infant and child mortality in particular declined - milk consumption among the very young increased, while everyone decreased consumption of fats, refined sugars and meat, mostly in favour of vegetables and fortified whole-grain bread.