From an agent.
Read carefully - the guy was never Haaland’s agent, he was simply a football agent who saw an opportunity to try and make that particular deal happen and make a bit of dough for himself.
But ultimately he got trumped by Raiola who offered Haaland a more attractive proposal and became Haaland’s actual agent.
“[There was ] a lot of truth about everything that went on and unfortunately then money talked. [Mino] Raiola came in and made the family a massive offer because he had a whole track of future transfers, clubs ready for everybody to earn fortunes with, and the rest is history.”
https://www.mirror.co.uk/sport/football/news/erling-haaland-leeds-united-transfer-25687460