Julliard can afford to be as competitive as it is because the input-output function is a strong bottleneck: You don't need many graduates (for every open violin position in European orchestras, there are roughly 800 graduates), there are plenty of kids who've been playing since the age of 6, so entry is competitive and standards are very high.
Programming? Very different situation. The market demands large numbers of CS grads, and (what the author so condescendingly calls) "natural programmers" are fairly rare. So standards suffer.