To my mind, it’s not that they “need” Chinese investment per say, it’s that China is the buyer
I used to work as a shipbroker, and would be the middle man between dry cargo commodity sellers and Asian markets
Iron ore in particular is massive. And most of it goes to China. The mines sell off take agreements eg so the Chinese factories come looking for raw materials and lock in long term supply contracts
Fascinating space actually. Literally at the coal face of global manufacturing