Yes. I think Whitman relies too heavily on Minister Gurtner & the commission in chaired in 1934. While it might have drawn from US sources & examples, it wasn't, ultimately, that influential in Nazi regime overall.

As I wrote before, Nazi encumbrance of Jews & other undesirables to the regime mirrored pre-Enlightment Europe, or contemporary Eastern Europe. This explains, in part, why many Jews didn't just flee when they had the chance. They had, in their family histories, seen most of it before.

More important, however, is the question: How does any of this change what happened in the US? Suppose one agrees with Whitman's central thesis. Does that change the history of Jim Crow, or the post-Reconstruction south? Jim Crow remains a vile stain on the American ideal, fueled by the malignant genius of separate-but-equal.