Chinese citizens can invest in the former, but (via government currency exchange controls) can't participate meaningfully in the latter.
So if China exits global stock markets... there isn't that much Chinese money being pulled out of them, because there wasn't that much in them.
What money China is investing internationally appears to mostly go to bonds, construction financing, and asset leases / purchases.
PS: What this appears to really be about is severing links for extraordinarily wealthy Chinese citizens to move money outside the reach of the PRC.
Which, if you were running an expansionist monetary policy intended to facilitate domestic economic growth, while simultaneously cracking down on the wealthy in pursuit of equality, is presumably something you'd take very seriously (as a command economy). Lest all that new & old money just fly offshores.
The problem with high inflation is that it usually (but not recently) goes hand in hand with higher interest rates (i.e. money costs more). Which tends to discourage business borrowing, which acts as a damper on non-financial investment (i.e. spending on factories, marketing, R&D, etc.). This has the effect of slowing down economic growth.
On the other hand, high inflation/high interest rate environments tend to arise when growth is high. Because high growth tends to go hand in hand with a rise in wages, increases in demand (which shifts the demand curve, and thus raises prices), increases in financial speculation, etc.
There are a ton more "on the other hands". Economic analysis is complex and difficult because it's a tangled mess of interdependent feedback loops that constantly change. A single policy action has an avalanche of cascading effects, some of which will be counter to the policy objective. I'm not suggesting humanity should just roll over in the face of this challenge. We should just be aware that it's a "hard problem" and there are never any simple solutions.