That Wikipedia article seems to imply 3.1 Gen 1 is actually a new protocol above 3.0, rather than explicitly stating that it's nothing but a misleading marketing term for USB 3.0. So, if a "USB 3.1" device doesn't explicitly say "Gen 2", you can't actually trust that it supports 10 Gbps. With USB 1.0 and 1.1, you at least knew 1.0 was 1.5 Mbps and 1.1 was 12 Mbps. Now 3.1 could mean either the slower or faster versions... Marketing professionals everywhere need some sharp implements applied to their posteriors.
Yes the USB 3.1 Gen 1 is the same as USB 3.0 5 Gbit/s
USB 3.1 Gen 1, USB 3.1 Gen 1 has the same 5 Gbit/s SuperSpeed maximum data signaling rate as USB 3.0 https://en.wikipedia.org/wiki/USB_3.0
I'm looking at the Gigabyte Z370 HD3 and it has 8 x USB 3.1 Gen 1 ports.