Actually it does not tell you "how dark the darkest black is", neither it tells you "how well defined blacks are".
Contrast ratio = 1000:1 (min white 200cd/m2, min black 0.20 cd/m2)
That basically means CR is telling you how dark the darkest black is Perhaps I should have been more specific and said "contrast ratio tells you how dark the darkest black is given a certain intensity of white", but I figured it was implied. Any formula that only has 3 variables is a definition (ie. contrast ratio = white divided by darkest black, 3 variables, contrast ratio, intensity of white and intensity of black). Its like saying amperage tells you how much power you're using... given a certain voltage, force tells you how much stress you have... given a certain surface area, contrast ratio tells you how dark the darkest black is... given a certain intensity of white.
But my point was simply, what's the point in him giving CR values to prove the awesomeness of blacks on his CRT when in reality it doesn't even tell you how well defined the blacks are, which is the most important thing?