The point about light direction in that blog post is worth taking seriously. In those family session shots, the sun is clearly behind or to the side of the subjects at a low angle, which is what creates that warm rim and the long shadows across the grass. When you're trying to push the lawn toward a cooler, bluer tone, that same backlighting changes how much of the green you can actually shift in editing before skin tones go off. If your own setup has the sun more overhead or in front, the approach won't translate the same way, so matching the lighting first makes more sense than chasing the color.