The author is an idiot.
There is always a viable intercept plot for any incoming warhead.
The issue is in time management.
From detection to plotting to firing to interception is sometimes too long.
Other times, its ridiculously easy and could be done on paper with a protractor and a ruler.
Ciws works, as does the standard sm3 system for inbound threats to ships.
Does he seriously suggest that the navy can’t hit incoming missiles?
It is, at heart, a math problem.
Yes...a math problem solved with high speed data processing.