You misunderstand in two ways. First, I wasn't hypothesizing. I was actually going from an earlier article about how the machine works. Second, this is a real computer, not a magical computer. It is doing something very hard and it takes many seconds to process a question and come up with an answer. When I say it is possible for a human to flat-out beat the computer, I mean that Alex can read the question, the lights can flash to let a human buzz in, and a human can have the correct answer ready while the computer is still churning away and doesn't even have a hypothesis ready. In fact the human is faster than even that implies because typically a Jeopardy contestant, especially at the championship skill level, already has the answer long before Alex has stopped speaking and now the competition is about who can buzz in correctly; Alex is reading for the benefit of the folks at home.
This computer is state of the art, and consequently and quite expectedly, it is barely capable of playing Jeopardy, basically. Next year, of course, for the same money you could build a machine 50% better for the same price, and next year, 50% better again for the same price, and so on... but this year it's just barely able to compete.