I have another bold theory, let's wait for the data later today to verify:

The more the US stock market falls, the more aggressive the southbound capital becomes!

Essentially, it makes sense to understand this from the perspective of a simple financial pricing war;

it's not that a financial war is happening now, but rather that the current southbound capital is subjectively carrying this kind of sentiment.

Whether the sentiment is reasonable is not important; what matters is that it has already happened and will continue.