I can confirm this, at least for the black Go 7. In other forums it was described that the white model has a different surface (foil?).

The Boox Go 7 (and also the Go Colour 7) does not have a pre-applied screen protector. At the moment, only the Note Air 4 C model comes with a protective film ex works - for all other devices, you have to buy it separately if you want one.