The Holodomor or famine of 1932-1933 was not genocide. It was a famine caused by severe crop failure and drought. The main casualties during this period were from epidemics, which were exacerbated by the famine. But it was not a policy of extermination. The Soviet government fought the famine, it bought food and sent it to the affected areas. All possible forces were thrown into the fight against the epidemic, and the fight against speculators and people who stole food was intensified. These measures made it possible to stop the epidemic and save many lives. Later collectivization and agricultural development finally solved the problem of famine in the USSR. There is no reason to consider the famine of 1932-1933 a genocide.
The Gulag was a correctional camp, not an extermination camp. Yes, the USSR had the death penalty. The death penalty is still practiced in some countries. But it was not genocide. It were executions of court-ordered punishments for crimes.
Before the Great Leap, China was a backward agrarian country. The goal of the Great Leap was industrialization and economic upswing. Oil fields were built, terraced farming and irrigation facilities become widespread. During the Great Leap, experience and skills were gained, which came in handy in the further development of the country. Villages where poor people lived established weaving workshops and forges during the Great Leap, which have now grown into textile factories and plants. Certainly many mistakes were made. These mistakes were compounded by incompetent cadres, traitors and counter-revolutionaries, and the breakdown of friendly relations with the USSR, where counter-revolutionaries came to power. But the mistakes were corrected, the traitors were punished, and the positive results were developed and multiplied. The people who died from mistakes during the Great Leap is a great tragedy for the Chinese people and the whole world, but there is no reason to call this policy genocide either.
Pogroms during the Cultural Revolution are a negative thing, but the Cultural Revolution played a huge positive role in identifying enemies of the working class and neutralizing them as a political force for a while. But it was not genocide either.
So, none of your examples is an act of genocide. And it can in no way be equated with a policy of racially targeted extermination of people by the nationalists of the 3rd Reich.