Unless the missile even whilst being supersonic in its flight path to the target is sea skimming/low level, it is likely to be an easier intercept than the incoming subsonic AshM's - as they are necessarily low level flights.
This is because supersonic missiles have a higher detection range compare to subsonic ones on account of higher IR and visual signature.
So if this missile is not flying at sea wave height, chances of detection is higher during the flight path. And it makes for an easier intercept. This much is certain. This is because IN is fielding fleet air defence SAM"s and not just point defence SAM's.
This means that the missile gets engaged before it enters its terminal maneuvers.
And if the missile is indeed more complex than what the reports posted here imply, then it would mean that if the missile is not intercepted during its mid flight range and reaches its terminal maneuver range, then it gets tougher to intercept for SAM's as the flight path then cannot be easily determined.
This part however as you said remains to be seen.
This post makes no sense. A missile coming vertically at mach 5.5. what will you use to intercept it? CIWS, RAM?