The antitoxin is a particularly attractive treatment because the effectiveness of vaccines is highly questionable. Besides the side-reactions, there is doubt about whether the vaccine would be effective at all against respiratory anthrax, and in any case a vaccine might well not be effective against new strains of anthrax. But all strains of anthrax presumably produce the same toxin, and that means the antitoxin would be effective against all of them.
"An old and discarded treatment"
"anthrax antitoxin has potential"
"multiple case reports as well as experimental studies have documented some benefit of this approach."
"Nass allows that the side effects could be nasty because the anthrax antitoxin would be crude, but that in a pinch it would be better to endure them than face the possibility of death."
"What we obviously need is a fast-track anthrax antitoxin program to get under way and strong support for researchers hoping to eventually produce an effective and safe antidote to anthrax."
This is an interesting article (thank you for bringing to my attention) about a possible avenue to explore in the search for a cure for anthrax. But that is all that it is. You could write such an article about prospective cures for any number of diseases that have plagued mankind for centuries: cancer, arthritis, heart disease, etc. That doesn't mean that we can cure any one of them.