I have Rivens to kill Dargyns without being being affected by status effects. One of them requiring Archwing mode, the other not. I have tried Inaros with Negation Swarm, and also  Amesha's Warding Grace. Mission was invite only, I was the host playing alone.  In Plains of Eidolon, the abilities are not completely preventing status procs.  I can see the status procs icons showing that Inaros was being affected by status procs - this happened several minutes after I had my Neg