Mighty Impel on targets with Flying Speed

Here's what Mighty Impel does:

10th-Level Path of the Giant Feature

Your connection to giant strength allows you to hurl both allies and enemies on the battlefield. As a bonus action while raging, you can choose one Medium or smaller creature within your reach and move it to an unoccupied space you can see within 30 feet of yourself. An unwilling creature must succeed on a Strength saving throw (DC equals 8 + your proficiency bonus + your Strength modifier) to avoid the effect.

If, at the end of this movement, the thrown creature isn’t on a surface or liquid that can support it, the creature falls, taking damage as normal and landing prone.

The question is: does the creature still fall if they have a Flying Speed and can't Hover?
All that the feature says is that:
- The creature falls
- It takes the normal falling damage
- It lands prone

If this was meant to only apply to creatures that can't fly, then none of this would need to be said. This is the behavior of the general rules already.
But specific rules like this one usually aren't there just to remind you how the general rules work. When something doesn't need to be said, it rarely is.
So if this was added, surely it's for a reason, right?

But on the other hand, the creature falling without being knocked prone beforehand, or having their speed reduced to 0, or Incapacitated feels weird. But also it makes sense considering that they're being forcibly moved up to 30 ft. Not a really a situation where you can easily stabilize in the air, even if you can fly. So it seems like a "specific beats general" situation here.

And yet... it feels weird.

The power itself does not knock the target prone, that’s a function of falling. So I’d say no, a flying creature does not fall.

I guess the exception would be if the barbarian threw the target down onto the ground. Then I’d have them take fall damage for the distance they were thrown.

I know, but it still forces the creature to fall. What the text says is that "the creature falls", so the creature falls because the description says so.
The expected answer would be "but you only falls if you can't hover and your speed is 0, you're incapacitated, or fall prone", to which I would reply "specific beats general".
In the case of Mighty Impel, the creature falls if they're not on solid ground after being moved. Not because that's the general rule, but because the specific rule of Mighty Impel says so. It is not a mechanical consequence of being thrown in the air, it's an effect caused by the feature itself... even though it feels weird.

Well, the way I read it, if someone throws you and you land on the ground, you’re not prone. So, why would throwing you from one spot in the air to another in the air make you go prone?