No, really folks. They do not evaluate, rate, star, stamp, approve or even ever mention any brands outside of listing their sponsors -- who by the way do not all meet the highest standards laid out by those guidelines.
They explicitly state themselves they don't do this
"The WSAVA Global Nutrition Committee offers expert, evidence-based nutritional information for companion animals to support the veterinary healthcare team. The committee does not endorse, approve, recommend or support specific products or companies."
It is a framework for consumers to understand what goes into responsible formulation.
While Mars contributes small grants to WSAVA that go to fund their guidelines on dozens of topics including microchips and vaccines, not all Mars brands come even close to meeting the highest standards of their nutrition guidelines (aka Nutro).