Yes , to expand on what you mentioned, one BSCU system ( the other being inoperative) still qualifies you to use a mid RVR of 75m. If you were to lose both BSCU channels the ECAM that will pop up will be ‘BRAKES A/SKID NWS FAULT’ so again it brings us directly to the unavailability of the NWS system. I’m not sure however if antiskid is related to what we are discussing (roll out guidance or control systems inoperative)