Communism

That's interesting, I didn't know that Lysenkoism bled into China, but your number is still nonsense because

The causation here is a simplification of a famine that had many other factors (I don’t think Lysenko was particularly important to it, even) and also a wild overestimation of the death toll of the famine

. . . applies even more to China. I'm no expert, but I've read a lot of people complaining about the GLF and its agricultural practices and that just never came up. I'm sure it's a bad way to farm plants, but I think what you're trying to depict is the product of anti-communists making mountains out of molehills wrt Lysenko. Lysenko is an incredibly convenient communist boogeyman who seems to verify every tired stereotype about communists, so saying it was this specific guy having an unfathomable level of influence [and thereby communism expressing itself to the fullest] that directly lead to a trillion people dead is an excellent bedtime story for those anti-communists so they have an easier time sleeping on the mountains of corpses butchered by their liberal states.