You idiot. Now every time someone questions an american history book, it's a conspiracy theory???. THINK
No one is questioning history books. They are questioning the loony theory that Germany not having to divert 40% of their forces to fight a second front. Anyone with any comprehension of how war works knows that. It wasn't until after the invasion when the German Army Group Centre was gutted for the western front that they were finally able (with our help) to break through at Lviv.
So if you want to argue WWII have at it. But expect to lose.
How many german soldiers did the rooskies kill or capture and how many did the americans kill or capture. That's all you need to know.
After throwing 1.5 million soldiers (who were shot if they retreated ) at the depleted lines the Germans lost around 800,000 men in two weeks. Is that the best you have?