In 2016, historian Mikael Nilsson argued that Trevor-Roper failed to disclose source-critical problems, including evidence that significant portions of the English translation were translated directly from Genoud's French edition and not the original German "Bormann-Vermerke" as claimed by Trevor-Roper in his preface. Nilsson maintains that this information was likely known to Trevor-Roper because it was laid out in the publishing contract that the "translation into English will be made on the basis of the French version by François Genoud". Nilsson concludes that "the translation process was highly doubtful; the history of the manuscript from conception to publication is mysterious at best, and it is impossible to be sure that the majority of the entries are in fact authentic (that is, actual statements by Hitler as opposed to things he "could" have said)". For this reason, Nilsson argues that Hitler should not be listed as its author because it is not clear "how much of it is Hitler's words as they were spoken, and how much is a product of the later recollection and editing process".