It is deployed against slow moving air targets. Some variants are even radar guided.

This video, though, isn't remotely convincing. It looks like the hellfire deflects off a bog standard drone, yet doesn't detonate, which disassembles and the look-down video cuts before we see the actual consequences. The path of the object is basic inertia where a rolling object is falling to the ground but we're seeing top down so it's "maintaining course".

These UFO things are always sadly a lot of noise and astonishingly little substance. There are "kooks" -- people who have decompensated and no longer are rational -- in every large enough set, including the military. There are always terrible evidence like these videos, coupled with people giving their completely unsubstantiated crazy takes.

Hellfires are usable as air to air weapons against slow moving targets. Apaches have shot down slow flying aircraft with them.

https://www.navy.mil/Resources/Fact-Files/Display-FactFiles/... "It can also be used as an air-to-air weapon against helicopters or slow-moving fixed-wing aircraft."

They are capable of hitting aerial targets as well. They have recently been deployed by the US Navy as a cheaper way to counter cheap aerial drones launched by Iranian proxies (~$100k Hellfire vs a ~$1m SM2).

https://www.twz.com/sea/littoral-combat-ship-can-now-rapidly...

They are Shot from a drones. This was shot by a drone.

Do you even read your own link? It says "usually shot from helicopters" right there.