As a centre forward it must be a nightmare to play with selfish players like Garnacho, Rashford and Antony on the flanks. You cannot make a move because you genuinely have no idea what the hell they are going to do. It's a similar setup to when SAF let RVN go when he had Rooney, Ronaldo, Tevez, Saha etc. RVN would make his run for a cross (one that Beckham would find) but it wouldn't arrive, because Ronaldo or whoever it was would have checked back or decided to run to the byline.
That forward setup just didn't suit a centre forward of his skillset. It's the same with Hojlund now, these wingers who want to cut inside all the time are no good for a central presence like him.
If you look at his PL stats. I think he has 1/3 of Haaland's goals from 1/3 of the shots and chances. His conversion rate is actually quite good, he needs to be stronger and improve in his hold up and link up play. But his finishing and movement is better than he gets credit for.
But he's already been written off by many.