Deng was alive and well when two of those stock exchanges were opened
That's... what I said? Obviously, Deng was the one who implemented economic reforms, such as opening stock exchanges and allowing foreign investment. Some Maoists consider this to be right-deviationist and counter-revolutionary, and that he should've continued more in line with Mao's policies. That's why I asked if you're a Maoist, since you consider his reforms incompatible with socialism.
I'm not sure who's whole argument was "look at the improvements only possible under Communism." China's conditions were much worse off than places like the US, so obviously it's possible to improve conditions to be better than per-revolutionary China (which is not saying much) without communism. It's just that in China's case, it was the communists that did it.