But that's the point, they don't show all popular skin tones on those portraits.
That's because photography has a long history of being developed specifically for white people: https://www.vox.com/2015/9/18/9348821/photography-race-bias
The point is that now they've broadened the range where the camera works well. So they are showing what's improved.
Tide ads don’t show every single stain their product could remove. Beer ads don’t show every type of person with a working esophagus. They’re trying to get black people to buy Pixel phones. Let’s not overthink this.
"Take authentic, accurate portraits with Real Tone. Portraits on Pixel represent the nuances of different skin tones for all people beautifully and authentically."