You raise a good question. My understanding of this is that whilst PH levels are maintained to the levels you mention there will be a fight going on. As blood has to maintain itself at around 7.4PH this is not ideal for pathogens, therefore pathogens will look to find acidic areas within the body to thrive. An example would be Sugar in your diet will allow acid to build up in areas of the body such as fat and organs where pathogens will flourish. Miracle-Mineral-Supplement will by its method kill pathogens in an acidic environment but how does that work? Think of your body as a house. In the kitchen a small fire starts (pathogen) if you leave the fire to burn it will take over the house and cause extensive damage. You then throw a bucket of water over the fire to extinguish it (MMS / Chlorine dioxide). This kills the problem and the rest of the house is now ok. Unfortunately you have now damaged the paintwork and this needs to be repaired. In order to repair the damage you need to use paint (antioxidants) to make everything fine again. You could not use paint on the fire or whilst the water is still wet as it would make matters worse but once the problem has been sorted the paint will keep everything looking and feeling nice again. It has been proven that when we have a virus our body reduces Vitamin C by 70% to allow oxidation in our body with T-cells because antioxidants prevent oxidisation which is how we kill the nasty stuff. We do not want to keep ourselves in this state for too long so once the problem is solved we should look to alkaline our body again making it an inhabitable environment for future pathogens. An occasional Miracle-Mineral-Supplement dose to keep on top of things would be advisable but keeping your body in a healthy state with good food, minerals and vitamins is the best way to stay in good health. The bottom line is - you sometimes have to fight fire with fire but slow down once that battle has been won.
This is just my theory based on research and not scientifically proven so I welcome any feedback from those with further ideas