The Škoda Superb and Toyota Carina E are both liftbacks even though they have boot lids that include the area between the tail lights.
'Liftback' is just a name for hatchbacks with less of a slope on the rear end, giving them a sedan or coupé-like appearance. It does not have anything to do with the height of the trunk loading edge, and liftbacks are still hatchbacks anyway; they have a rear door with hinged glass that opens to a cargo area not separated from the passenger compartment.
I think the best way to describe the RX-7 is 'liftback coupe', but it is still a hatchback.