This is the first time I have seen the image in that page. No, I did not get that prompt.

I didn't watch the Google Buzz demo video, because I'm not interested in Buzz. I shouldn't have to watch something I'm not interested in to find out how not to take part in what I'm not interested in. It also took me quite a while to figure out where the turn off button was - since its not in the normal settings, where I would expect to find such things.