Inconclusive? Indeed. But it does not confirm any real world benefits of synthetic insulation. Really. Just don't swim with your down jacket on and you should be okay...enjoying higher loft, more warmth, less weight, and a longer lasting product. I trek every year on Vancouver Island and it is very wet there. I always take down.
Of course, if waterproof down does what it claims, any synthetic will be completely, and utterly obsolete.
Hopefully they can be recycled.