They were always Eredar. That is what their race is called. They dubbed themselves Draenei, yes, but isn't that a mere term? Like a faction or a culture? For instance if a russian guy moves to spain he'd still be a human no matter whether he calls himself a russian or a spanish guy. If that rule applies to those blue Spacegoats too, they all are Eredar yet a Legion Eredar will become a Draenei as soon as he switches sides and has to hide from or fight the Legion.