From the article:
Maybe the monitor manufacturers are scamming us. Maybe they're making the monitors larger, but somehow they've changed the way they measure pixel sizes (or the spaces in between the pixels), making them only appear to be bigger. Perhaps they somehow changed the technical parameters when we were all busy being impressed with the newer "digital" media. Yes! That's why sales reps are all pushing us on refresh rates, brightness, and contrast ratios instead of good old dots-per-inch!"