The military forces were segregated, even blood and plasma products were segregated according to race in WW2. The historical facts about black people's second class status would easily explain why there aren't any in this movie. I visited just about every major WW2 museum in Normandy and hardly saw ANY. This author didn't do his research. Sounds to me like this author doesn't have a clue and is just being contrarian and trying to start a fight, stir up racists,etc.
I think you're exactly right, Cyborg. Most people here are aware that desegregation of the military did not begin until after WWII.