Wut, turns out Sony flagship wireless headset (xm 5) does not support PS5.
The older model, xm3 have aptx support so potentially compatible with PS5 via USB Bluetooth aptx dongle that faked itself as USB audio instead of USB Bluetooth.
But the latest model xm5 didn't support aptx, and have no support for whatever PS5 wireless is being done for dualsense audio.
Edit :
Oh turns out xm5 compatibles with Bravia TV. So it's just Sony being Sony, they want you to use Bravia TV
The older model, xm3 have aptx support so potentially compatible with PS5 via USB Bluetooth aptx dongle that faked itself as USB audio instead of USB Bluetooth.
But the latest model xm5 didn't support aptx, and have no support for whatever PS5 wireless is being done for dualsense audio.
Edit :
Oh turns out xm5 compatibles with Bravia TV. So it's just Sony being Sony, they want you to use Bravia TV