"I'm just proud of the way we've worked hard to get our game where we want it to be. It hasn't happened at the speed we'd like it to, but we saw signs of that tonight.
"There is no doubt the team has felt a whole lot of different pressure. I was just proud of the way the guys have hung in there and not got tight under the pressure and played with a bit of ambition."
The All Blacks' dominant success represents just their third Test win of 2022, and prevented Argentina from sealing their first back-to-back victories over their hosts.
Foster was delighted with how his team responded to the criticism coming their way, adding: "It was a big week for us. We had to respond, and I thought we did it in a really ruthless manner.
"There were a lot of questions about putting the same group out again, but I really believe in the direction we're going and am delighted with the response against a pretty enthusiastic Argentina team."