If so I'm amazed, because I have never seen someone conflate those two before. I've seen plenty of people conflate USB-C and USB 3 in general, but not specifically thinking USB-C implies the 10gbps mode.
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.
As make3 said, bandwidth can be important, but it's also becoming more-so the case that people have computers that only come with USB-C. Obviously not a dealbreaker since people can just buy an adapter, but it's an issue worth bringing up.