In order to perform LVO (low visibility operations) a series of requirements have to be met, basically:
- Airline has to be LVO approved in their AOC.
- Aircraft has to be qualified and maintenance up to date to maintain airworthiness of equipment.
- Crew have to be qualified for LVO and current.
- Airport has to be approved and able to host LVO, and LVO needs to be in force at the time of approach.
If any of these requirements are not met (maybe the CAT II/III ILS on destination was out of service due to a failure, or any other thing) you cannot perform LVO. So as you can see the fact of the aircraft being capable is only a small portion of the whole thing.