What is the author's style in Child of Hitler: Germany in the Days When God Wore a Swastika by Alfons Heck?

The perspective of A Child of Hitler is that of Alfons Heck, a German-born survivor of World War II and former highly-ranked member of the Hitler Youth. Alfons serves both as narrator and protagonist, though decades of age separate the two experiences. Alfons narrates from his perspective as a child and teenager as he can best recall though he often reports events in the future and discusses the fates of people he encountered that he had no way of knowing at the time.