I do not think that this is correct.
The IR us using the TAS from the correlated ADR to calculate the wind speed from the GS. Consequently when the TAS is wrong in case of ADR probe blocked the GS canīt be correct. In order to see the true GS one can only open the GPS monitor page on MCDU as Aquarium said. The "Air France case" showed clearly the problem: TAS jumped from 461 kt to 182 kt and back. W/speed changed from -30 real to 249 and back.