This dongle seems the wrong way round, why would you want 3 long cables coming from your headset to your PC with just a short thick annoying dongle right at the end? Surely you'd want the 3-way bit quite close to the headset with a single long Type-C cable going to your PC. They could have at least put a female Type-C receptical on for other cables or something
Maybe it's a single cable to a dongle which is either VirtualLink or triple cable.
"This adapter cable features the same quick connect design used by the Valve Index Headset tether to replace the standard three-port (DisplayPort, USB, power) connection cable."
Oh after looking at the pinout it's kinda obvious why it can't output to a female receptacle, the usual USB2 pins are swapped for USB3 so most Type-C cables will have USB2's 1 unshielded twisted pair rather than the 2 shielded differential pairs used for USB3 signals on those lines/pins. Maybe this is a triple standard Type-C connector(DP alt mode(inc TB3), USB3.x and USB power Type-C ports) to virtuallink? Or maybe this is just a place holder image.