Been a couple years since I watched it, but IIRC about 5-6 hours in there's a segment about the United States in the Reconstruction Era, and how black people were poor innocent victims who were just picked on for no reason by the evil meanie KKK and even the US government. It seemed like the goal was to contrast the US with NS Germany so as to imply that the US has no moral standing to condemn anything that happened under the 3rd Reich, but if the entire point of TGSNT was to clarify that Germany's history of atrocities has been fabricated, then that part sticks out as being almost overly defensive, dishonest, and ultimately pointless. Idk, like I said it's been a while, so I'd have to watch it again to reassess specific claims, but it really turned me off of a documentary I was otherwise enjoying to the point that I stopped there and never went back.

All of that is to say, I think TGSNT needs to be seriously condensed and polished before I'd feel comfortable recommending it to people.