People certainly were abused and died in large numbers especially in the Death Marches at the end of the war, but the point of the camp in question wasn't to kill people, it was to house slave laborers

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Working people to death is just as bad. And Guarding the people while they're being worked to death is helping to kill them.

So he gets a free pass because he was ok with helping other people be worked to death instead of fighting at the front?

Near the end of the war, there were 2,000 people dying a month in the very camp he was guarding when he was there. And they were dying their because he was helping keep them there. He was involved.