The thing that caught me was that the FPV would disappear... FPV would largely be a result of all things IR and the only ADR part is barometric...
In pure theory, there are at least two ways to come up with an FPV : either take pure inertial reference and point a vector using IR, or compute the -almost- same vector by subtracting AoA from pitch. The second method needs air data.
What you end up with is either a ground-related FPV (inertial) or an air-related FPV.
Which theory was used in the A330 ?
Well, answers, answers : from QRHs, on the B777 side we have an inertial FPV, which the QRH states is reliable and to be used in airspeed indications loss situation (unreliable airspeed ind.), on all A320/330/340 the QRH states FPV unavailable... Draw your own conclusions.