“Are you asking if there was a time lag between the blood products being available to the JW patient and being available to the general population”
yes, that is my main question.
Imagine the immunoglobulin injections now they are “allowed” by the cult, but I think that for some amount of time (I don’t know specifically how much years ) they are presented by the medical community as an optional treatment and the JWs rejected that option because the blood prohibition.