The decision to punt is more a confidence in his defence then offence. If you give up the safety you are giving up 2 points and giving them the ball back.
If you punt, you are believing that your defence can at least hold them to a field goal.
So far it has been working well for him. Will they give up the TD one of these times? Sure, but I prefer the more aggressive believe your D can get the stop approach.
I think you see him give up the safety if we either have a large lead where the points don't matter so much, or we are against a heavy wind.