I have a slightly different idea, Haaland is not the key factor that helped Man City win the championship. Erling Haaland is a small player in a big match, he always fails in the final.
EPL is tough because the elite and average club are competitive. Manchester City won the EPL title because Erling Haaland made good use of his goal scoring opportunities and also his teammates played a major role in game victories. Pep Guardiola arrange his strategy and every player played a role in accomplishing their targets, no one was left out. Erling Haaland is a top player and goal machine for Manchester City.
If we talk about this season, Haaland has experienced a slight decline in goal productivity. But that still doesn't make Haaland lose his place in the Premier League's top scorers. In the 2023/24 season, Haaland managed to contribute 27 fewer goals because last season he managed to collect 36 goals. So for next season Haaland has to improve his abilities, not only his goal scoring skills, he also needs to improve his dribbling skills because so far Haaland ball control is not very effective and you could say he is not very good at it. I know he is a specialist goal machine, but if he can add one more ability then his statistics could be much higher than this season and last season.