How does wireless streaming work? 4k 144Hz over a USB connection?

I've just noticed that the 6GHz wireless adapter that Valve showed has a USB connector.

How is that supposed to work, exactly?

If you're not plugged into the DP/HDMI port of the GPU, the frame needs to go into memory first (increasing latency), then squeeze through a USB connection.

Even worse, what Valve shows on their page is a USB-A connector on that adapter. This tops at 10 Gbps.

Now granted, with enough compression and foveated rendering, they might manage to make it work.
But still, I can't wrap my head around what they're asking out of USB.