I do think the author misunderstands the fundamentals of Dune but that's a side point. Still, I note that Dune is not about Paul Atriedes going native to atone for anything. Paul and his mother Jessica knowingly use a cultural manipulation protocol to hijack a culture and fundamentally alter it. The best Paul gets in escaping guilt is the conviction from his precognition that he was -- despite all evidence to the contrary -- an instrument of destiny than a conscious actor.
But as I say, this is a side point. The essay is well written and provocative.
I should add as a matter of full disclosure that my own "race fantasy" movies are more in line with Inglorious Basterds.