After you edit, I would really be interested in knowing your sources. Frankly.
Your point about "new book" can make sens when the author is trying to be sensational... But there it is a serious work done by a Lt-Col from the German Army who worked for years in the Archives of the German army and had also an extensive access to the French archives...
On the other hand, after WW2 some authors were more interested in making political statements than using facts.
For example, after the Defeat of France, a trial was held (
http://en.wikipedia.org/wiki/Riom_Trial) were Vichy wanted to explain the defeat by showing that the French people was defeatist (if you read the link you will see that they didn't succeed) and some of the reasoning about the defeat was used without questioning by Alistair Horne in his book
To Lose a Battle, 1940 in 1969...