He can win as many Golden Boots, Premier Leagues and Champions Leagues as he want at City but winning the Balon d’Or is near impossible unless Norway win the World Cup (LOL!) or move to Real Madrid or Barcelona.
The Balon d’Or is heavily biased towards the biggest clubs in Spain. Look what happened to Mbappe. He won the World Cup with France and was the best player in the tournament but Luka Modric won it ahead of him when he wasn’t even the best player for Real Madrid that year
If it’s hard for Mbappe to win it then it’s virtually impossible for Haaland unless he moves out of City. I can guarantee Jude Bellingham win the next Balon d’Or if Real Madrid win the Champions League.
Unfortunately, Ballon D’Or is like any other voted award. It’s more about perceptions and popularity, than actual performances over the season. It’s highly possible that Haaland would not win the Ballon D’Or at City.