A big part of his and Mattogno's argument relies on a deceitful and equivocal use of the term "able bodied." Mainstream historians are not referring to 20 year old men with the flu when they talk about "non-able-bodied Jews," but those incapable of work due to their age or disability or incurable disease.
As for me, I do not understand why there is a contradiction between wanting to exploit able-bodied Jews for labor (which would mean feeding them, patching up injuries they sustain on the job, etc) and killing non-able bodied Jews. Clearly a murderer could also prefer to exploit his victims economically before killing them.
Also, Nazi policy could change throughout the war in light of labor needs. For example, 1942 deportees to the Reinhardt camps were almost all killed, but a substantial minority of deportees to Auschwitz in 1944 were used for labor.
As for me, I do not understand why there is a contradiction between wanting to exploit able-bodied Jews for labor (which would mean feeding them, patching up injuries they sustain on the job, etc) and killing non-able bodied Jews. Clearly a murderer could also prefer to exploit his victims economically before killing them.
Also, Nazi policy could change throughout the war in light of labor needs. For example, 1942 deportees to the Reinhardt camps were almost all killed, but a substantial minority of deportees to Auschwitz in 1944 were used for labor.