Michael Mills makes an interesting point in this letter to Irving, but probably not the point he wanted to make!
In a nutshell, the Hoefle Telegram and Korherr Report contain identical figures for Jews transported to the Reinhardt camps. However, Hoefle used 'zugang', which means 'influx' or 'inflow', whereas Korherr (on instruction from Himmler) changed his wording from sonderbehandlung (special treatment) to 'durchgeschleust', which means 'guided through'.
We therefore have two contradictory forms of camouflage. Hoefle camouflaged death camps as labour camps, whilst Korherr camouflaged them as transit camps.
The contradiction reveals why it is absurd of dim-witted deniers to claim that documents should be read literally. The only explanation that makes sense is that camouflage terms are being used, as the same populations of Jews could not have been simultaneously admitted as labourers and sent to the USSR because they were unfit for labour.