Yes, it does seem to me too, that the Governing Body has made to door open for birthdays once again.
Because while the application of this update was all about the clinking of glasses, which is now to be just viewed a friendly act. The telling comment about wedding rings (although known to have pagan origins) seems to me more important.
However as the Governing Body likes to use of precedents, by referring back past Watchtower articles or announcement, there might well be more in this line of reasoning. Thus in six months time, a Governing Body member could quite easily refer back to this update as the foundation for a discussion of birthdays. Saying in fact that while birthday celebrations may have had a religious connection thousands of years ago, its now just viewed as another ... friendly act.