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I'm just going to note that hypersonic is generally used as a buzzword in the Iranian context, not the 'uber weapon to fear' of cutting edge missile technology. It's the difference between categorizing by speed or by form-function.
Basically any form of ballistic missile moves fast enough in the terminal phase to reach velocities of Mach 5 (6100 km/hr or 3800 miles/hr). That's what the Iranian Fattah-1 does. That's what the Cold War SCUD used by Iraq in the Gulf War did. And that's what the WW2 German V2 did. This is basically just the applies physics of gravity on an object high enough and with enough time (distance) to be accelerating. It's not particularly impressive, and it's not particularly hard to defeat in missile defense terms because that speed comes with an increasingly locked-in trajectory that makes interception (relatively) easy because it's pretty clear roughly where a ballistic trajectory is going to end up. And because it is a ballistic trajectory- meaning because it is going high- it can be detected relatively early in the transit process.
Hypersonic weapons in the 'this is scary new technology' are referring more to 'hypersonic glide bodies.' These are the things that are pushing through the air on the power of rockets / scramjets / etc, like, well, hypersonic missiles that are not ballistic missiles. These are far harder to do, because they have to rely on their motors/propellant more than re-entry acceleration, and more significant stresses to critical components. However, because these are taking a far more direct route to the target, and are reaching their hypersonic speeds more as the mode of travel rather than the re-entry criteria, they are doing so considerably faster, and are going to be detected relatively later (and thus with less time to react) due to the reduced ballistic trajectory exposure. This is the scary thing in future wars because of the potential for a hypersonic adversary to first-strike you with almost no-effective warning.
This is a picture from the wiki page on the relative difference. When Iran boasts about its hypersonic weapons, it's using the ballistics but trying to claim the reputation / insinuations of the HGBs. (Such as by claiming that the final-stage re-entry munition is a glide vehicle, and thus furthering the conflation, even though the more relevant capability is the path between launch and final-phase.)
...which is actually one of the reasons the technical claim of yesterday's attack on Israel was met with a relative shrug. It's roughly the equivalent of when Russia boasts about having successfully conducted an attack with a nuclear-capable missile. So many of Russia's conventional weapons are nuclear-capable that it doesn't actually mean anything special. Similarly, when Iran boasts of its hypersonic ballistic weapons, it's generally boasting on the cutting-edge prowess of 60-year-old-tech (hypersonic as a function of speed).
60-year-old tech is certainly still usable, and the Iranian missiles are probably better than anything that could have been built 60 years ago thanks to GPS if nothing else, but it's still a bit of an obvious flex to impress people less familiar with the distinctions.
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