Manchester United’s Portuguese head coach Ruben Amorim speaks to supporters after the English Premier League football match between Manchester United and Aston Villa at Old Trafford in Manchester, north west England, on May 25, 2025. [AFP] Yan Gang speaks for many Manchester United fans when he says: “We’ve been numbed by performances over the past few seasons.” Manchester United once claimed to have more than 100 million followers in China, Yan among them, but like supporters of the club everywhere their loyalty is being put severely to the test. As an illustration of United’s fall from grace in China and…