The POV character is Joseph Stieglitz, a Hauptsturmführer of the SS, stationed in Hungary shortly after Germany invaded the country and replaced Miklos Horthy with Ferenc Szálasi.
In the meantime, Stieglitz is tasked with rounding up a village of Romani people (called Zigeuner in German), in western Hungary, consistent with the Nazi Party's real life efforts to exterminate the Roma.
The nature of this alternate timeline is revealed when a Hungarian driver describes Adolf Hitler's service in the Austria-Hungarian Army on the Eastern Front of World War I.
As Stieglitz arranges for the Romani village's population to be placed on a train for occupied Poland, and, implicitly, their deaths, he further reflects on Hitler's antiziganism, which developed on the Eastern Front in part because of the efforts of Romani on behalf of Russia (who he reportedly saw stealing horses, telegraph wire and boots, leading to unnecessary deaths and injuries of German troops).
Thus, in this timeline, the Nazis are actually accepting of Jewish people, while the Romani, communists, and homosexuals are the focus of Hitler's wrath.