On his third trip to China in a year, Nvidia CEO Jensen Huang – head of the world’s most valuable company – was on a full-blown charm offensive.As a guest of honour at the China International Supply Chain Expo, Huang’s visit underscored the recent thaw in Sino-US relations. Upon arrival, he announced Washington had cleared the way for Nvidia to export the H20 – a made-for-China AI chip less powerful than its gold-standard acceleration model, which was banned for export to the country in...