This doctor has had a 100% success rate. All the doctors and hospital administrators are already pushing back. Of course they would. One, there haven't been any long term studies done on it, and two... They don't make any money if all you need is to stay at home with a nebulizer.
By the way, the action this guy is taking requires you to start the treatment right away if you are positive. (not waiting until you are dying, like the studies will often try to do)
Watch and make up your own mind. This and/or Hydroxycloriquine are what we would use if infected.