There is no doubt that Haaland is one of the best strikers in the Premier League if not the best because he score plenty goals that people never expect in his first season in the Premier League, but this season, he has played some matches without scoring goals due to the absence of KDB in Manchester City's midfield.
Yes, there isn't much good balls to leap on and with De Bruyne absence opponent's main focus has shifted towards Haaland and he is usually in tight spaces now. I think I expected that pretty much when KDB got injured. I think if someone steps up and start feeding in some good passes or crosses then Haaland can again be on a scoring spree. It just needs a bit of better understanding and coordination.
The problem with this is that when KDB is not in the squad, Pep's scheme also becomes different because they will prioritize attacks carried out on both sides especially some players like Alvarez, Bernardo Silva and Foden they prefer to play dribbles rather than breakthroughs made and it was seen in the last few matches especially for their match against Brighton 2 goals they produced came from attacks that started from both sides.
Manchester City do have a lot of good players but for the problem of initiating the ball and the flow that is created from the midfield pass only KDB is able to do that so when he was injured then one pattern of Manchester City's attack was lost.