China doesn't have much of its economy in the stock market and the ones that are listed there are the more vibes based companies generally, or limited portions of bigger companies.
Stock market in US matters because that's the retirement/social security fund for a shit ton of people. In China, that role is served by other public funded interests.
It's actually amazing how we see the wisdom of the CCP decades after its policies.
Long ago, people lamented China's limits preventing Google from dominating China with its world-beating services. When Trump came to office in 2016 and the bans started to target Chinese tech, we saw how smart and important that decision was, otherwise America could fry the nerves of our tech industries.
Now, we had people lament how China's financing is behind and doesn't have a robust stock market where people trust to put all their savings into for long term appreciation and can rely on growing old. Now we see why that's a great idea in a full scale trade war.