It turns out meritocracy is like reason. You can't criticize reason without appealing to reason just like you can't criticize meritocracy without appealing to meritocracy. Notice how everyone who criticizes meritocracy is criticizing a specific meritocracy based on its unfairness (this essay certainly is). So why do they all use the universal form when they're talking about a particular one?
Also, something I don't understand here is the idea that meritocracy is bad because people don't have equal opportunities. It isn't good that people don't have equal opportunities but it doesn't really have anything to do with meritocracy. If John gets straight As, and aces his SATs, and comes up with a novel theorum by age 25 because he has good parents and Jim doesn't because his parents suck, sure that's unfair, but what does it have to do with meritocracy? Is our meritocracy supposed to punish John for having good parents and reward Jim for having bad ones? Is that somehow more fair than rewarding John because of his demonstrated ability?