Your right about that, Manchester City have had a lot of lapses this season especially with the injuries sustained by both Haaland and de bruyne, because the dou's absence left them in a very devastating situation.
When De Bruyne went on injury at the beginning of the season, until he came back from injury, Manchester City's performance wasn’t really good, they lost some matches that they were not supposed to lose, and they were finding it difficult to score in most of their matches. The player who is always giving Haaland assists was on injury, which also made Haaland's performance drop, Haaland also later went on injury, but immediately after both of them came back from injury, Manchester City's performance improved significantly again. We all saw how the two players performed well in today's match against Luton Town. De Bruyne and Haaland are just a good combination, and if one of them is not available, then it’s going to affect the team’s performance.