So this hyper thing flies low and slow? Then it climbs to the top of the high dive, also slow. But it locates a target and falls really fast? But no one is going to notice it climbing out? Yup, I can see why that would work every time. No one would ever take a shot at a dumb bomb flying straight up? Even our old F-14’s could catch that thing?
It depends on whose hypersonic missile and which design we’re talking about, but generally these things have a flight profile like the old AIM-54 Phoenix - they climb out fast, cruise fast at very high altitude, and then either dive straight down onto the target as a top attack munition or dive down to wavetop height and come in hypersonic. Something like the Khinzal mentioned here is launched from more than a thousand miles out (over the horizon) so the first sign you get that the mail’s coming is when *maybe* your radar picks something up at over 100k feet moving at multiples of mach.