The way firefox does it can connect the downloading session with the running session. You can argue with the value or validity of that, but it seems like the chrome installer cant do that, which is nice.

As for why it's in the article I think it's valuable to include it since if chrome was doing it too it might be seen as just "normal", but now it seems even more weird that firefox which is supposed to be the privacy alternative is tracking something that google is not.