Buffed Civil Warrior's abilities state that each armour up buff reduces opponents bleed and poison AA.
Archangel's non-buffed abilties state that he is immune to ability accuracy reduction from his opponents abilities.
Now CW's bleed and poison AA reduction is written in his abilities and not even given to him by a node.
Therefore, Archangel should be immune to CW's AAR.
Turns out, he isn't. Archangel is unable to apply a single bleed once CW has a few armour up buffs, however his posion AA is still working:

I will upload two videos and post the link below. One is a duel target CW and the other is in UC EQ.
I don't have a video but first experienced in the current SQ.
Have the latest version of the game installed, play on a Samsung S8.
No boosts. Both wifi and data.
Excuse my scrub gameplay.