Why did Tsingshan take a short position?

Can you explain why Tsingshan, a major player in the commodities market, decided to take a short position? What factors influenced their decision to bet against the market? Did they have specific insights into market conditions or supply and demand dynamics that led them to this conclusion? What potential risks and rewards did they consider before taking this position? It's fascinating to see how market participants like Tsingshan navigate the complex and often unpredictable world of commodities trading.