Big difference in my opinion.
Higher education is "discouraged" more than forbidden. Some are not allowed to serve, but it is considered a danger, not a sin. Blood on the other hand is one of the BIG sins. You know the JW big sins. Taking blood, celebrating a birthday or holiday, talking to disfellowshipped people and going to a different religions ceremony.
So yes he went to college, but that wasn't a sin.
My thoughts revolve around how this works in real time in the hospital. He sees someone in need of blood. He makes the call that it may be neccesary, and then asks someone else to order it? Is that really the process? So he makes the decision, the diagnosis, the recommendation.....but doesn't place the order......and its all good?