Honda has a requirement, for its tires, that the motorcycle must be able to hit a curb at x mph, and not suffer rim damage. Maybe Suzuki has similar?
My best guess is the tire pressure is based on the vehicles maximum load.
If you were selling motorcycles, and legally responsible for the information you printed, would you go to paper with air pressure recommendations for a 175lb rider, or use a worst case scenario setting where the rider was 300lbs and his wife 350?
I believe if I were forced to make it simple , easy, and legal, Id go with the heavyweight settings.
I think the days where they could publish the best settings for suspension, or tire pressure were 2001.