FYI, if you read overseas Chinese forums (so Chinese people who live in the US and therefore are familiar with actual prices in the US and in China), they generally estimate the real PPP exchange rate to be about 3:1 CNY-USD for top tier cities. So 300,000 CNY in a first tier Chinese city would get you approximately the same standard of living as $100,000 in a major US city. And the ratio is probably closer to 2:1 if you compare a second tier Chinese city with a second tier US city.
At 3:1, that would put the real Chinese economy at about 160% of the US economy, significantly higher than the "official" IMF PPP ratio of 127%.
But you haven’t factored in OnlyFans. That is like an automatic 30% boost to soft power productivity. China may have the advantage in AI and in the near future, EUVs, but core tech like stepmom pron will always be safe.