They also didn't use it to connect to the controllers. They used two nRF24L01 transceivers which use Nordic's proprietary shockburst protocol. Easier to set up and better latency.

Yeah, the second-gen[1] Samsung Odyssey+ headset likewise has a built-in dedicated receiver in the headset and it's a significant improvement over the first gen. (I like the first gen better in practically every other way though.)

[1] There's much debate about what 'first gen', 'second gen' actually mean in terms of VR, I just mean it's Samsung's second WMR model after the Odyssey HMD.