If you believe that winnig a best movie award is not just for director then why have not you considered this for the other directors for example ben affleck won 2oscars and one of them is because of directing argo according to his imdb page ?
It doesn't have anything to do with "believing" in anything. That's how the award is given. IMDb just documents that. "Best Director" award goes to the director. Best Picture does not. In Sports, I might be the "Most Valuable Player." And that award goes to me, not the manager. The "Championship" trophy goes to the owner of the team, not me nor the manager...that's just how such things are set up. A site documenting those awards would not change it because they believe Manager should get the trophy.
There is no problem to report. As indicated in your last thread on the issue, the page does accurately reflect the awards as they were given (or nominated).