OK, let's assume, for the sake of having nothing else to do while waiting for the "big news", that a GB member did have a blood transfusion. Let's assume that some Bethel insiders leaked the info to some outsiders and they confirmed the action by somehow securing hospital records.
All they have to do at Bethel is deny, deny, deny. Any "records" produced are made up by apostates and is a lie is all they have to say. And the sheep will buy it. It's not enough of a scandal to involve any kind of investigation by authorities so it becomes the stuff of Internet lore along with the UN and Dateline as far as believing JWs are concerned.