You're literally coming up with the argumentation as you go. Firstly it was "Deng already in the 70s" explaining the 1965-1970 growth of life expectancy, now it's internal power struggle. You're just making shit up as you type, deeply unserious analysis. The Cultural Revolution from Mao is precisely this 1965-1975 period, it wasn't "internal power struggle". Surely this is the stable point of Chinese history in which Chinese were left to themselves?

I'm gonna stop arguing with you because you're simply talking from ignorance of Chinese history and making up shit as you speak. Maybe consider for one second why India, Bangladesh, Pakistan, Indonesia or Philippines aren't as developed as China are, having a comparable starting point in early 1900s. Spoiler: they're not communists