Considering that rabies is 100% fatal once symptoms show up, that father was just plain stupid not to take his son for treatment.
The “Wisconsin” protocol has had two successes, and several failures. Until we know why it was successful in two cases, we won’t be able to do much to improve survival of symptomatic rabies.
How about all those people who died of rabies in the old west. That would mean hundreds or even thousands of deaths from rabies to that one survivor.