In almost every instance, famines are caused not by actual insufficient amounts of food, but by failure to make the necessary accommodations to assure a supply line is always available and being utilized by the government authorities involved.
The United States and other food-producing nations around the world have more than enough capacity to take up the shortfall in Chinese harvests, and they are willing to make that largesse available to the Chinese government. But Xi Jinping, in his wisdom, cannot or will not divert resources to meet this internal crisis (largely due to his intransigent actions and diplomatic responses), as that would mean giving up some long-term goals that are inimical to most of the Western world and other Asian nations.
The CCP gave; the Western world COVID-19 Wuhan virus, and they are reaping the whirlwind. I feel not a bit sorry for the CCP, but they have subjected a billion and a half human beings to their own mistakes and vehement bilious tantrum.
While that is true, it is a factor that cannot be removed from the equation.