The article is talking about retail banking, which is different from investment into stocks and shares.

It's perfectly possible to have retail banking customers living abroad removing large amounts of capital from China, while at the same time foreign investors are injecting large amounts of capital into China. Two different flows.

I think the biggest impact is going to be places like Australia that benefit greatly from Chinese nationals abroad at the moment. There are lots of Chinese students and Chinese property owners in Australia. If they can't get access to their money, that's going to hurt Australia more than China.