He canMy knowledge on this is purely empirical, I've used him in this situation and he works, so my hypothesis is that the armor breaks apply before the stun.
BPCW reflects stun by cosuming one armor up buff. No buff to consume, no stun reflectCorvus will break all armors when parrying. So BPCW does not have any armor up buff to consume, so your corvus will not be stunned