First, One-Child policy is a former policy ment to limit the population growth of China. This was due China thinking that it needed more population increase control to tackle the challenges of industrialisation. It only applied to Han Chinese and not the ethnic minorities living in China. There became a skew of male-to-female ratio, which was a shame. The global ratio is 107-100 and the chinese one was at the worst 120-100 and that created some new social issues.
Regarding social credit system, as I have said earlier, and linked documents to the actual planning outline it is a different take on the US credit system.
"Great leap Forward" was a horrible tragedy and a political travesty. 50Million deaths is a pretty highballing number aswell as % wise it was better than the Irish Famine(still not saying it was a good thing)