The EredarDraenei were there, but they had only been there for like 200 years.
Which is like 6 months in spacegoat years. They probably hadn’t even finished unpacking.
Plus they part they had was:
<A Burning Legion Steering Committee Meeting>
Demon 1: We found Velen’s lackeys again.
Demon 2: Where are they now?
Demon 1: Some planet they named after themselves… again.
Mannoroth: It says in this briefing there there’s another species on the planet called O-rcs.
Demon 2: That’s ‘Orcs’, sir.
<Mannoroth’s Fel Drain kills Demon 2>
Mannoroth: Let’s use these Orcs to screw over Velen’s lackeys. I want a situation report this time tomorrow.