Looks like it flies quite good - but I'm not sure the HK statement either - 'floats like a kitten' paints the wrong picture for me too.
I'm guessing they mean its 'cute' and 'gentle' to fly. Yes, kittens are cute, and they can be gentle I'm sure... But has anyone seen a cat fall in a pool? While cats can swim perfectly fine, I think the stroke they use is called 'The Insane Eggbeater'. Not gentle or cute at all.