Alright, maybe I've just missed it, but I didn't see on of these on Velobase, either.
I'll never tell someone again that they don't have a cassette freewheel.
Now for the visuals:
Says freewheel on it.
And when you remove the cogs, you find a stepped body, sort of like a freewheel.
And the cogs are all loose with spacers, just like a cassette.
And there may be a better tool, but the Shimano-style BB tool works for the lockring.
But Suntour insists this is a freewheel, and Suntour cassettes I've seen have a traditional look freehub body.
So what would you call it?