The "redudancy" assumed by this design of speed sensing - which at this point is not different than other manufacturers - seems to target intrinsic/internal sensor failures and less a failure caused by external events, such as weather.
Indeed - and it even only partly achieves redundancy for intrinsic failures, since design/manufacture faults are likely to be present in all sensors if they are from the same manufacturer & type and maybe even from the same production batch.
Since airspeed information is probably THE most important data in an AC (pilots, please correct me), this neglience to provide both true sensor redundance and obviously not implementing secondary, heuristic means to verify and/or determine air speed is incomprehensible to me.