Manchester city just had to do the necessary thing by bringing Haaland. Manchester City with Haaland I think the team is more stronger than last season. It will be easy for Manchester city to win the Champions League. Real Madrid don't have a player that can score more goals like Halaand in Manchester city.
Ah okay. And what about Manchester City in previous years? Did they have a bad team then? I don't think so.
I wouldn't write off the other teams. Besides Manchester City and Real Madrid, there are some other teams that have great chances to win the CL e.g. FC Bayern Munich or of course PSG to name two strong competitors.
Overall, however, it must be said that winning the CL can not be planned. There are many strong teams with an extremely high level and often it depends on daily performance, luck and the right motivation whether a team advances. Just because a team has the strongest squad on paper, it doesn't mean that the team will win the CL.