Zyobot
Just a time-traveling robot stranded on Earth.
Well, then the Holocaust would have to immediately become put off the table. Still, once word gets out that Jews in Nazi-occupied Poland are being confined in disease-filled ghettos and that German Jews can't even marry or have sex with gentiles, I would certainly expect Nazi Germany to become an international pariah.
What would Hitler do about that, do you think? For one, there's the option of delaying or slowing down the extermination process that he and his cronies took so many pains to hide IOTL, though I also fear there's potential for him to lose it early on and hurry it up as fast as possible, in no small part due to the shock of the ISOT.
There's also the recently roused giant on the other side of the Atlantic, which Germany has already declared war on. And somehow, I doubt Roosevelt will be okay letting that slide, much less letting the Reich run wild in a Europe woefully ill-prepared for German aggression.