The link doesn't load right now (HN overload?) but I wonder, if the comms are down, shouldn't the system report "no data" as opposed to "all clear"? Why should

The link doesn't load right now (HN overload?) but I wonder, if the comms are down, shouldn't the system report "no data" as opposed to "all clear"? Why should there be an explicit warning about not trusting it when the system itself should easily be able to tell whether it's getting fresh data?