This crosses into nationalistic flamewar, which we ban accounts for, so please don't do it again. More generally, please don't post aggressive snark here, or any snark.
Early Maoist policy hadn't helped matters, but it's pretty hard to argue American, Japanese, and European policy hadn't already left them in an incredibly shitty position.
As for Mao holding back China, no doubt there were big problems. But the greatest increases in life expectancy at birth came under Mao [1] and his push to greatly expand access to medical care and education in rural areas. That was itself an investment which set the stage for future growth. (It's a lot easier to get things done when your people aren't dying at age 45.)
[1] https://data.worldbank.org/indicator/SP.DYN.LE00.IN?location...