The numbers I have for Cat 2 approaches are for Cat A/B/C aircraft DH 100ft and RVR 300m. For Cat D aircraft it’s DH 100ft and RVR 350m. For Cat D aircraft the RVR may be reduced to 300m if they conduct an auto land.
For the A321 that’s a Cat D aircraft, planed Cat2 manual landings are not authorised, so the 300m would apply in this case.