If the Nazis really had all this technology, why didn’t they win?
Among other problems, they spent a lot of time developing very advance technology instead of producing practical, usable aircraft, tanks, etc. in sufficient numbers. Worse (for them), Hitler was an idiot. Me-262 was initially developed (very slowly) as a bomber ... had they pushed it into production sooner as the interceptor that it actually turned out to be, life for BBC and Eighth Air Force would have been even uglier than it was.
Hitler was no Napoleon.
Because Obama, the miracle worker that he is, went back in time and single handedly defeated them in the ultra secret Battle of Das Stier Sheisse.
Maybe they had interesting ideas that were not practically manufactured, like their King Tiger tank uesd at the Battle of the Bulge. Although heavily armored, it was so big and underpowered, it could not effectively maneuver. Like the sturmgewehr assault rifle, it was too little, too late.