Yeah that's what I noticed as soon as I saw the suit. The original robocop is a ROBOT. You can see that his skull is artificial, he only has his face left.
That would make no sense. If it was just his face left, then why would he have memories? Last I checked, memories aren't stored in the face.
Also: he has to eat. Remember the baby food. He must have some other organs. Robots don't have to eat.
He's a cyborg.
But, I agree, the original has a much more effective make up job.