Google Talk was never Jabber. The Google Jabber integration was way before that in Gmail. Google Talk was what came after Google decided to abandon Jabber.
Wikipedia says otherwise.
If Google had actually supported Jabber instead of sabotaging it, we would not have this discussion.
Google kills messaging services all the time and launches new, incompatible ones. Google did not sabotage Jabber, they sabotage their own chat services all the time.