No; and the only 'academic' source used for this is a now discredited Canadian historian by the name of James Bacque. Bacque's investigation also hinged on the fact that the International Red Cross was largely denied visitation rights by the US Military to these open-field camps. The United States did not sign the Geneva convention (the agreement that imbues the ICRC with their privileges) until 1955; and had thus far adhered to the tenets of the convention out of a sense of decency and their own national laws. In denying the ICRC right of visitation, they committed no particular wrong, but the strange timing of it naturally has fed well into apologist narratives. The most damning indictment of Bacque's work springs from his claim that Eisenhower was deliberately callous and indifferent; when the reality is that most German deaths occurred out of a combination of the actions (rather, inability to act) of the other allies, the general shortage of food in Europe, and the average health of the German fighting-man when they were made POWs (re: the average German was in quite poor health when captured).

His numbers are totally fudged; to put it in perspective, the Rhine Meadow camps that are the origin of this story at their peak contained maybe 2 million disarmed combatants of Germany. Bacque is therefore advancing a bold claim; that well over half of the German POWs perished - this is simply not the case. Did Germans die? Yes; the British reneged/were incapable of taking in their initial estimated share of German POWs, and thus the US Army had to shoulder the burden. An estimated 3000 German POWs died due to exposure and malnutrition as a result. An absolute travesty, but also a sterling testament to Eisenhower's back-breaking efforts to adapt to this sudden swelling in the expected number of POWs. To make it clear: your projected number of POWs do not double in a short period of time without dire supply consequences; it would have been totally plausible that the death-toll would have skyrocketed had the US Army not strained every nerve to adapt to the rapid shift in the situation.

In point of fact, the United States in general had the fewest number of POWs die on their watch of all the combatants, and a commission was launched by the US Army's medical department post-war to explore the shortfalls. The US Army showed a keen interest in ensuring that nothing like this would ever happen again to POWs under their care.