I’d assumed they were measuring throughput of the switch, not all ports combined. Whether they’re counting a gigabit of traffic going from one host to another on the same switch as 1 gigabit or 2 gigabit. Given the exact round number I’m hoping they’d be counting this as 1Gbps.
What I haven’t found is whether this is still 70Gbps with 100B frames, or if 802.1x changes anything. I’m assuming switching silicon is cheap enough for this to be the case.