I agree with FlightDetent. If you have mentioned this as part of a briefing you would make an exception .
It’s an interesting case of a failure : it is one that is unrelated to auto land capability ( it would not downgrade you from say CAT3 DUAL to SINGLE ) but it also happens to be one that is not inhibited by the LDG INHIBIT ( because it requires investigation if you had been using managed NAV ) .
The major thing to consider here is that it does not affect your auto-coupled approach and auto land , but should you go around at minimums you would not have time to assess if you could trust your NAV mode to manage you missed approach .
When Airbus advises you to Go Around in this case , it covers itself from any potential cock-up from considerations you have not briefed or thought about