It's definitely bad UX. Curtis tries to brush away criticism with his claim that the "kudos" number is "an otherwise meaningless number," but this argument is fatally flawed. Plenty of things that human beings use for social signaling are, when removed from context, technically "meaningless", but within context they can hold plenty of meaning. In the case of Curtis's website, the "Kudos" counter is implied to display a count of voluntary approval. By essentially tricking users into incrementing the count, Curtis violates this expectation, which is why everyone feels "cheated" by it. Subsequent visitors to the site who don't realize the counter has been gamed may take it as an indicator of how many people enjoyed the article, when in fact the numbers are inflated by other users against their will. This is not only terrible UX, but bordering on outright deceit.
In a world dominated by social media and ubiquitous "Like" counters, for someone to brush off a Kudos count as "an otherwise meaningless number" is either an incredible display of naivety or straight-up bullshit.