Hmm maybe you're not talking about the same thing. I think the parent means that if your phone shows you the message in cleartext on the screen, then someone who has access to the phone can read it.
You can read the message by looking at the screen, and Google can technically read it because they "own" the OS that prints it to the screen. Whether they do it or not is another question, but they can.
You can read the message by looking at the screen, and Google can technically read it because they "own" the OS that prints it to the screen. Whether they do it or not is another question, but they can.