> Is he a war criminal? <
Yes, if he was killing prisoners. I read an article written by a GI who was in western Germany just days after the Nazis surrendered. His unit was marching down a country road. Off to the side of the road was a French soldier. The Frenchman was calming shooting German prisoners, one after another.
Was the Frenchman a war criminal? Yes. Should that Iraqi, or that Frenchman, hang for his crimes? I donno.
They were just dealing with their PTSD. Who is the worse criminal, the Frenchman killing NAZI prisoners or the VICI government bureaucrats helping the NAZIs.