Here's the thing. In 2022, Bills Rookies played 477 snaps, and went out in the divisional round of the playoffs. Chiefs rookies played over 2000 snaps in 2022 and they won the superbowl. This is the reason people think the Chiefs have done a better job drafting. A lot of fans think winning Super Bowls is better than establishing culture and process.
You can argue against the rookie contribution being an important part of Chiefs super bowl win if you want. But most people are not caught up in causation arguments. They simply see the correlation of the chiefs rookies playing 4 times as much as the Bills rookies while winning the Super Bowl and conclude that means Veach did a good job drafting.