Vulkoras Desolator's Phase Missile Swarm don't hit corvettes
Might be intentional. Corvettes are small and aren't meant to be hit by most normal attacks.
Antorak Marauder's Phase Out Hull do phase out ennemy but it does not the 200 points damage.
Yes it does, but it only does it after the ability wares off, not when it's first hit (as its invincible while phased out).