It's a hardware audio interface with a very low latency (buffer of 64 samples, 3.6 ms), which supports both PipeWire and JACK over Ethernet, as shown on the pictures in the post. It's audio over CAT6, and a lot of it, 6 inputs + 8 outputs (TRS balanced) at 48 or 96 kHz.

Imagine having this on the stage right next to your analog gear, and a computer 50m away.

(Opening the page under discussion was actually helpful, it lists all this right at the top.)