I don't think you know as much about neurology as you think you do. These doctors weren't just throwing darts -- they had a theoretical reason to think that the treatment might work, and it did. Anyway, time will tell, and probably not very much time. No doubt this technique will be tried again on the very next symptomatic rabies case in a developed country. Most likely, this treatment will become standard and fairly reliable.
I'm sure there were people who insisted on attributing the amazing early results from penicillin to divine intervention. But alas, it was the mold.
See #32....and I completely understand your doubts and where they come from.