I've seen similar things in our area (Minnesota) where you drive through a snowstorm, but the radar shows nothing in theare.
I can't see how any weather predictor could be correct in that situation.
The latter is somewhat common because the models (AFAIK) use probabilistic estimates, where different initial conditions generate potentially distant outcomes. The number of “rainy outcomes” defines the probability of rain, and doesn’t necessarily get updated with real conditions.
Fwiw, I agree with your bemusement and scorn - it's not good enough! (I say this as someone who has had roles where I issued these 'always stale' forecasts)