I don't think this is a fair comment. Relative to both its population and its economic size, Chinese articles are over-represented in prestigious peer-reviewed journal publications (think Nature and Science).

Do some trash articles out of china find their way into journals? Yes. But if you think the US/EU doesn't put out some garbage as well, I can tell you're not in academia.

Is this specific paper worth anything? I don't know. But I do know it's entirely unfair to simply write off an entire country out of hand.

Any bold statements made that can't be supported will quickly be shot down by other teams. So long as they've been transparent enough about their methodology others can try replicate their results. You don't have to like China or w/e for Chinese research to be valid.