I see this previews for "Race." I'm willing to bet Jessie Owens was far more concerned with the structural racism of the United States (you know the country he lived in) than he was with the policies of the Nazis at the time. After all the US government has killed many more black people than Germany. That trend has actually continued to this day.
Remember this was pre-holocaust that notable period of industrialized slaughter was still a while off but genocide wasn't a new concept even if the word hadn't been thought of yet. in fact, at the Hitler was quite an adored figure across the world.
I'm going to go out on a limb here and guess this movie is going to come with the message "Yeah the US has a history but hey, at least, Hitler's never been in charge! Am I right black people??" That's quite the message for a country that likes to hold itself up as such a moral authority. "Hey, at least, we didn't have the Nazis right??!!"
Well whether or not the US has ever technically been run by Nazis is debatable, but all that aside when it comes to Hitler and that 12 or so years of Nazi rule in Germany, who is more evil? Who really has more blood on their hands? Is it the US with its genocide of the natives all the way up to its current global war on terror or is it the Nazis?