Raul Hilberg estimates that over 800,000 died from "Ghettoization and general privation;" and 1,400,000 who were killed in "Open-air shootings" during the Holocaust (according to
this write up) - the point the Lanzmann film makes (and his Sobibor documentary) is to do with the absolute
bureaucratisation of the Holocaust, which obviously included massive technological elements, but wasn't totally over-determined by them - blaming 'technology' pure and simple sometimes seems to me a way of not blaming the people who used it.
With regard to bureaucracy, the Sobibor rebellion could only have taken place because the guards were so organised and punctual - those in the camp took advantage of the timetables in order to murder their captors.