[jaggirs]

I haven't read the paper, maybe their benchmark is flawed as you say, and there are a lot of ways for it to be flawed. But assuming it is not, I see no problem with using the word superhuman.

Out of curiosity, would you agree with me if I said 'Calculators have superhuman capabilities'? (Not just talking about speed here, since you can easily construct complex enough equations that a human wouldn't be able to solve in their lifetime but the calculator could within minutes).