With Haaland signing with Man City, I think they are definitely favs to win the Premier League again next season. You can't really get a better striker than him at the moment(maybe Harry Kane?). Striker was the only role that Man City were really lacking in. Even though Pep's style of play doesn't really require an out and out striker, it will he handy to have one in clutch situations where they could whip a high cross in, instead of trying to put in low through balls.
Manchester city is fighting to retain their first position in the next premier league table, with the lessons gained during the last season that made them lose out on the championship there will be needing players like Haaland will be a good asset to man city in the next season.
Man City main priority is to win UCL next season I believe that prompted the club to sign Haaland, their are some crucial matches where Guordiola played false nine in the absence of Gabriel Jesus or due to some changes in tactical formation, the arrival of Haaland will address that issue, definitely the team will continue to dominate EPL with the quality of players in the squad, however the coveted UCL trophy had remain elusive to the club despite winning the EPL trophy consistently the team is now a complete team and one of the best in Europe.