Well, in the context of Wehrmacht memoirs... you can pretty much take it as a prima facie conclusion that you’re reading self-serving apologia. Guderian is particularly guilty of this, more on the side of inflating his own military acumen & importance to the development of military thinking than on the war crime denial side, but virtually all of the German generals who published postwar memoirs were peddling self-exculpatory bunk. Guderian’s Panzer Leader, von Mellenthin’s Panzer Battles, von Manstein’s Lost Victories and (I think literally) dozens of others were all written to present the authors’ side of the war in the best light possible. All of them lie and obfuscate as to their role in war crimes, all of them are laughably racist towards Slavs and “Asiatics”, and pretty much all of them portray the Wehrmacht as more skilled and more professional than it really probably was. The only memoir that springs to mind as being different, off the cuff, is Johann Voss’ Black Edelweiss: A Memoir of Combat and Conscience by a Soldier of the Waffen-SS which is from an enlisted point of view and not a commander. It is unique among Nazi memoirs that I’ve read insofar as the author comes to terms with the fact that he was a member of an irredeemably criminal organization, and expresses sincere grief and remorse for what he was a part of.

If you want to know more about Nazi postwar apologism and myth, look for a thesis by James Curry called “From Blitzkrieg to AirLand Battle: The United States Army, the Wehrmacht, and the German origins of modern American military doctrine.” It should be available online and it has great content about the way the Nazi high command presented themselves postwar. Smelser & Davies’ Myth of the Eastern Front is equally as good if not better for this topic, and is the first WW2 book I tend to recommend to people. I’m typing this out on mobile so a full bibliography and links to prior answers will have to wait until morning, but I’ve written at greater length on this before. Oh, this Army Heritage and Education center lecture by Dr. Geoffrey Megargee (“Not The Stuff of Legend: The German High Command in WW2) is also pretty good: https://youtu.be/bLJol2jcOIE