Hmm, I don't see the basis for this conclusion. This treatment is acting according to the common definition of a vaccine. Whether before or after disease activation is not part of the definition. As far as your personal belief, I understand that you may feel strongly, but I'm sorry to say that doesn't really enter into articulating an accepted scientific definition.
vaccine: any preventive preparation used to stimulate the body’s immune response against a specific disease, ...
https://www.dictionary.com/browse/vaccine
Could you be more specific about any particular legal shield? They all have to go through the same phased trials system. I don't see any reason to conclude this is a legal shenanigan. What they have created meets the well-known definition of a vaccine.