I don't get it. A guy from Google wants to convince me that it is simultaneously impossible for Google to listen to me, yet it does listen for me to say "a few

I don't get it. A guy from Google wants to convince me that it is simultaneously impossible for Google to listen to me, yet it does listen for me to say "a few keywords" and also determine the song I am currently playing. I'm not saying google is listening to me, but his direct evidence seems overwhelmingly contradictory.