That's exactly what this is, it's just not made very clear in the article. It's a DSP box that connects to your equipment via HDMI and supports a range of wireless stereo headphones. These have been out for a while in Japan already.
Look at the gallery pictures on the product page. It's certainly not milled from one piece of aluminium. The front and sides are made from a single piece of aluminium which I assume has been bent because milling that would be insane. The top, bottom and rear panels are all separate.