The meat of the article is behind the paywall.
My theory is that
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China has better integration between academia and industry - I'm mostly basing this off how in the US the academia is chronically underinvested so that the private sector can get it's plunder of smart graduates, but when it comes to AI development you actually need academic knowledge of intelligence otherwise you're just approaching it like an engineering problem
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US companies are incentivized to spend more, the more broke they are the smarter they seem, so there isn't really any incentive to improve in smart ways because you can just rack up a bigger bill with your investors and keep the circular economy going.
Would love to know what the recipe says though.