At a guess they are probably saying that a human when looking at a picture of a palm would not be able to tell you who it is, unlike a picture of someone that i

At a guess they are probably saying that a human when looking at a picture of a palm would not be able to tell you who it is, unlike a picture of someone that includes their face or body. Seems a bit of a pointless distinction as the Amazon Go stores heavily rely on cameras to track people when in store.