Are you referring to the animated stretchiness of the text as you pull up from the bottom? Because I believe that's just a responsive element of Google's Material Design. I don't see anything happening to the kerning itself, but then I'm on mobile, it's a gif, and I'm tired.
It's relatively subtle on my phone, and even more difficult to spot in this gif, but concentrate on the bottom-most comment, the "a few" and the "because they", and you can see how the text squeezes up horizontally when I scroll down.