[Franek Grabowski]

The author, quite contrary to you, spend a considerable time researching the topic, gathering documents (including French ones), interviewing veterans, etc. Thus the book was based on period documents, and the fact that the author wants to make it more up to date, and to add more informations, does not mean it is out dated. There is also another author, who did extensive research on the topic, and whom you did not mention, making the only reference to Wacław Król's books.
You are neither expert, researcher nor author, so I would suggest you to shut up, and let Greg S to speak on the subject.