Cyborg, robot, whatever. His neck and back of the skull are artificial in the original and the make up makes it look like it removed parts of his neck, instead of adding onto it.
There's a rather large difference between a cyborg and a robot.
The Six Million Dollar Man, the Original Robocop, the Reboot Robocop, Darth Vader: cyborgs.
C3P0, R2D2, Robbie the Robot: robots.
One has organic parts, one doesn't. And, a major point of both Robocops are the integration of man and machine and the question of humanity.