The glass is definitely 'tinted', to use the correct technical term. It is also toughened, so as long as the scratch does not penetrate the outer 'tough' skin, it can probably be polished out. If it was deep enough to penetrate the skin layer, then failure would occur, in the same manner that the old toughened (pre-laminated) screens did.
I used to work for Pilkingtons, the glass manufacturers in St Helens, so I know something about the problems that can beset toughened safety glass.
Good luck with the polishing!
Edited by: Tim Jeal