If it truly reaches mach 5 in air to air profile with 300km range, it could easily hit mach 5.5-6 in air to ground with 350-400km range, more than enough warhead size / kinetic energy to knock out radars.
dont think about max speed here like the spedometer on your car. its not gonna accelerate to mach 5 and just stay there. its gonna peak at that speed momentarily and then slow down again. and peak speed is going to be achieved in the most favorable regime -- at high altitudes. remember air density is much higher down close to the surface, shooting high to low will see the missile decelerate almost like shooting bullets into water. long ranged missiles invariably will follow some sort of lofted trajectory to spend as much time as possible up high to reduce the amount of air resistance faced, but at the end of the day what goes on at 80,000ft is not the same as what the missile has to deal with in its final moments closing with the target.
cherrypicking superlatives out of context is just another one of those little shitty tricks of storytellers to make their stories sound cooler.
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