Mulan, I think the change most likely lies in private instructions given to elders. I read somewhere that years after the WT article that you are referring to, the society sent private information to elders stating that ones could in fact have dealings with disfellowshipped family without being punished. However, from what I read, they were instructed to keep this new information confidential, however if they heard of family having contact with df family members, not to pursue the issue judicially as they had been instructed earlier. Therefore, with this reiteration in the KM, I would bet my ass that they have also sent private info to the elders stating that now they should judicially pursue those who do associate with df family.
Anyone have further info on this or a correction to my understanding?