The
map looks generally like the Stammlager but with the
exactitude of someone cribbing an aerial photograph as
the basis for a drawing, although the number of barracks
is a bit scanty: remember the map is from 1941, the
interrogation from 1944, and there was a lot of building
going on in between.

You are right, “everything helps history”, and that should be your sole criterion. . . . Furthermore, the documentation you provide anent mass shootings and other forms of maltreatment will help convert other revisionists away from wholesale rejectionism of Jewish claims of mass murder.