SDMA isn't related to networking. As I mentioned here: https://news.ycombinator.com/item?id=24294868

The device is exposed over USB as a composite device, consisting of a virtual Ethernet port and a virtual serial port. Network communications may happen over that link, as well as SSH/SCP'ing files.

It also supports USB OTG, so one could plug in a libre-compatible Wi-Fi card and use that.