According to the article, though, the "urban setting" was next to a highway, which isn't typical of any urban setting I've lived in. And the "natural setting"

According to the article, though, the "urban setting" was next to a highway, which isn't typical of any urban setting I've lived in. And the "natural setting" was still in the middle of Stanford, which isn't really what I would call a natural setting. If the parent lives in an urban area similar to the "natural setting" of Stanford's campus' green area(s), then I'd say that yes, the parent would benefit. The study seems pretty handwavy, though. I'm not sure that a walk by a highway counts as a urban area control group. (Although, it also depends on what "highway" they are referring to. The street in front of the campus is not a highway the same way the freeway/interstate is.)