This is really a two edged sword for JWs .
1) On the one hand it does support what we were told by WT , at the time that diseases such as AIDS and Hepatitis C can and were contracted from blood products.
2) On the other hand it shows that the blood fractions ,which they nowadays allow and seem to almost encourage, are just as liable to carry a disease, if one should be in it. . The haemophiliacs taking factor 8 were just as badly affected as anyone having a transfusion.
That fact seems lost on the JWs I know, who are too busy saying “ We told you so !”
They don’t want to know either…..