The article refers to the banality of evil in realation to Eichmann. There's actually been quite a bit of historical push back on this assertion, which in some ways has been used to rehabilitate Eichmann's image as a bureaucrat. Eichmann while not the chief architect, was definitely partly responsible for the Holocaust's "success" and actively climbed the nazi hierarchy by finding a niche to fill - exterminating jewi…
Heidegger was an enthusiastic Nazi and Arendt also defended him. Some people see the "banality of evil" book as essentially being a defense of Eichmann.