I know it may be surprising, but bandwidth is a really important factor for speed in deep learning, and USB-C would help with that.
I think you're referring to USB 3.1 gen2, which would double the theoretical bandwidth to 10Gbps.
I went back, looked, and yes it does support USB 3.0. Actually given the chip itself also apparently supports GigE it's a shame there isn't the option with that brought out.