Atreus' question come out of fear, but Kratos' response is what the article focus on. Kratos does not take any joy in killing, he does that out of necessity and would have loved for that necessity not to arise. He could have boasted "I have killed bigger things", but instead he choose words of resignation against a kill or be killed fate he was trying to escape

> he does that out of necessity and would have loved for that necessity not to arise

Which I believe is in contrast with the older games. Haven't played them but from what I've heard he'd pursue conflicts because he enjoyed them. I think this change is because of his ongoing process of coming to terms with being a father which takes the act of killing and twists it inside out.