He may and probably is going to break all goal scoring records this season but there will always be criticism regarding the rest of his game. The challenge will come once Guardiola leaves city and they are no longer as dominant; he will have to do more than poach goals than he may be found out.
The lack of ability outside scoring means that even if he does outscore everyone, he won't be mentioned in the company of Pele, Messi and Maradona. Something similar to Cristiano.
That's the goat triumvirate in football. You're essentially arguing that because Haaland won't go down as one of the consensus top 3 greatest players ever, that he'll be disappointed or will be a disappointment.
Not everyone can be a Messi, Maradona, or a Pele. Going down in the 2nd, 3rd, or 4th tier of all time greats definitely isn't a disappointment. It's a remarkable achievement for someone who doesn't possess the skillset that the players you mentioned do.
He can go down as a top 10 player ever if he lives up to his potential and stays away from injuries.