It could be argued that announcing that someone has been disfellowshipped could be defamatory by nature. In this jurisdiction, defamation was* defined as anything communicated to a third party that could lower that person's reputation in the eyes of their peers. A disfellowshipment announcement could certainly be seen in that light.
The change in 2005 was probably to deflect a possible rise in defamation suits against elders and possibly the GB as heading up the whole defamatory machine.**
*Current law is different from when I learned it
** There are probably still plenty of jurisdictions that would allow defamation suits over a disfellowshipping announcement, even though the principle I "quote" above isn't the current defamation law. I might have a look at different regimes to see if the WT's caution in changing the announcement was prudent, at least in the face of defamation suits, when I have time.