There is clear confusion between the concepts.
For example, the Taepodong claims that the KN-23/24 are hypersonic missiles, they are, but they are not maneuverable like a MaRV let alone an HGV. These North Korean missiles are called aeroballistic or semi-ballistic because they don't follow a parabolic trajectory, but on a depressed trajectory, they never leave the atmosphere, and only a few ballistic missiles in the world are semi-ballistic and leave the atmosphere, but still do not meet a ballistic trajectory per se.
The people who claim that the North Koreans have tested a MaRV are correct, at least if it's the vehicle in the image I've attached, it's definitely a MaRV and not an HGV. Conical warheads that have small fins (MaRV) are not able to glide like an HGV, because of the low lift/drag ratio.
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For example, a missile like the KN-23/24 could be equipped with MaRV to improve accuracy, it will meet a depressed trajectory as it does not even leave the atmosphere, so in the terminal phase, the set of fins will give an advantage in the maneuverability of the missile to hit the target more accurately, and even acting on that trajectory it will be at hypersonic speeds.
Qiam 1 is a short-range ballistic missile designed and built by Iran. It was developed from the Iranian Shahab-2, a licensed copy of the North Korean Hwasong-6, which are versions of the Soviet Scud-C missile. The Qiam 1 entered service in 2010, with a range of 800 km and 10 m precision, equipped with a MaRV.
