To the extent that the Chinese investment is corporate, it's to buy up our assets, especially ones in short supply for the future industries, like Lithium, rare earths. And property, of course.
But that's not the reason Americans invest in Australia. They do so more as an extension of their business in the US.
Without doing a deep dive, I’d guess US investment in Oz is better net-net for Australians than is Chinese. But I don’t know and could be persuaded otherwise.