Revisionism to me is about discounting the entire thing as a fraud and a lie. Saying 5,999,999 G-d's Chosen died instead of 6 million doesn't make somebody a revisionist. The whole gas chambers, mobile gassing vans and crematoria nonsense needs to be exposed as a hoax.
That Himmler book couldn't come at a worse time. More and more young people, people my age, in their teens and twenties, are questioning the HolyHoax. Ceding 3.5 million gassed G-d's Chosen could cripple the movement for decades.