Make the math ... and the result is not "little less than one minute"
The speeds were invalid because of disagreements between the sources ("incohérence") from 2:10:05 to 2:10:51, which is indeed a little less than one minute.
They then became invalid again at 2:11:40 until 2:12:02+15 -- but, as the report pointedly states, because of IAS falling below 60KT, NOT because of disagreement between the sources.