they can't exclude him based on demerits on his license if it's not a position that requires him to be driving at all
if it was a position that had him on the road, driving vehicles, then yes, they could - but for a call centre position, it shouldn't

DH's brother worked for Vic roads for 30 years before he passed (and his Dad for Vic roads/country roads board before that) - just asked DH and he has said no way would they be able to discount him on that