The Chinese civil war happened immediately after WWII. The Russians, instead of scrapping their war material they'd transferred to the Pacific theater after VE day, simply gave it all to the Chinese Communists. That's what enabled them to win.
This is interesting as most Chinese texts, scholars, and newspapers already are critical of Mao for his Great Leap Forward and the Cultural Revolution.
I think it was because the professor said, "The only correct thing he did was to die."
That implies that Mao's victory over the Republican forced was incorrect and thus, the foundation of Communist China was also incorrect. Which the Chinese Communist party would not tolerate.