The R&F have softened up significantly against the No Blood policy, partially because the WTBTS has gotten into big trouble over the years. Based on a cursory review of the jw.org articles, the emphasis has been significantly reduced so people slowly start to forget what the rules are.
Also, most likely you didn't even violate "current" WTBTS guidelines. It's easy to assume that JW's refuse all blood product transfusions, but that's not so. I forgot when it changed exactly, but the rules have indeed loosened up.
MOST blood product transfusions currently in use during routine procedures are actually acceptable to JW's. The things they reject (whole blood) is rarely used in a modern Western hospital's medical setting, perhaps in a military field hospital they still do vein-to-vein transfusions, but organizations like Red Cross breaks up donations into their components and has done so for a long time to allow for a larger distribution of a single donation.
The reason the JW's got a bad rep in the 80s and 90s is because they refused at one point ALL blood products, but then they slowly added more and more fractions to the point that effectively with few exceptions, the JW's no longer have a ban on blood-derived products used in modern medicine.