I believe that in the original formulation of the Turing Test the judges were asked to hold two conversations: one with a computer and one with a human. Afterwards they chose which of the two they believed to be the human. In that scenario, being identified as "human" more than 50% of the time would indeed make you "more human than human"; with a "perfectly human" program the test becomes essentially a coin-toss. In that context the 30% threshold makes a good deal of sense.
But in this variant, "Do you believe the entity you spoke with to be a human or a program?", a 100% threshold is theoretically achievable. That means you're entirely correct: a 51% vote of confidence is decidedly less human than human. Additionally the 30% threshold they've used is laughably low in this context. Without a control group, even an 100%-confidence outcome probably says more about the beliefs of the judges than the ability of the program to simulate a human.
I don't mean to take away from the no-doubt impressive achievement by the team behind Eugene. I just take issue with the hyperbole in its reporting. But, ya know, the media will be the media, and academics gotta get research grants.
I'm pretty sure you're human, with a high degree of confidence, much higher than 50%.
So to are you more human than human?