As I said, it's pretty well known that Auschwitz and the other camps like it were extermination camps, not (merely) concentration camps. I mean, I'd count myself a member of the "public at large" in this context (I'm certainly no expert on the Holocaust or the surrounding history), and yet I still know what the correct term is. Anyone who has so much as looked at the Wikipedia article for Auschwitz or one of the other camps will know the correct term.