Newey said the team's difficult start to the season - with a car lacking performance and overweight - had been caused by a combination of designing the car late because of his arrival at the start of March last year, and the discovery that organisational processes at the team were not fit for purpose.
Mercedes' George Russell took his second win of the season with victory from pole position at the Austrian Grand Prix.
Max Verstappen recovered from a crash in the final part of qualifying to finish second at Red Bull's home race, with championship leader Kimi Antonelli in third.
For Hamilton it was a moment of redemption after a first season at Ferrari that left him questioning himself, and others questioning him.
It was painful to watch him at points last year, as he wrestled with the confusion created by his lack of pace. He called the season a "nightmare". He called himself "just useless". He suggested Ferrari should get another driver.
Cricket scorecardscan appear confusing at first glance, with multiple rows and columns indicating how well - or badly - both a team and individual player is faring in a match.
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One Week, One Title: Football in Greenland
One Week, One Title: Football in Greenland
Arctic conditions mean outdoor football in Greenland has to be played in a narrow window of time. BBC Sport travels to Nuuk for the Greenlandic Football Championship.