[arijun]

The article said ICBMs were hypersonic, and those certainly spend a lot of time outside of the atmosphere.

The gliders seem to spend the entirety of their trip in the upper atmosphere, though.

[dabluecaboose]

Reentry does kind of by definition enter the hypersonic regime, but it's somewhat unintuitive to the layperson since Mach 5 is much slower at those very low pressures, and it's an entirely different beast than flying at Mach 5 in-atmosphere proper