The first real statement of the Arne Slot era came on Sunday as Liverpool blew Manchester United away at Old Trafford, winning 3-0 thanks to a brace from Luis Diaz and a second-half goal from Mohamed Salah. Alisson Becker needed to make a couple of smart saves, particularly from Joshua Zirkzee, but there was no question that Liverpool were on another level to Erik ten Hag’s side, proving to be so ruthless during the stage of the contest where the game was in the balance. In fact, it could have been even more embarrassing for the home side. Trent Alexander-Arnold had an early goal ruled out for…