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Basically what he's saying is that you should see BOTH moving vertical bars on BOTH the black and white test patteren, turning the black and white level up or down until one bar is visible and keeping the level at just before the point where the other bar next to it disappears into the background.
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That is correct. All the moving bars in Avia are *within* the range from black to white. The black bars in Avia are both *above* black. The white bars are both below white. If the bars are clipped off, then you are losing shadow detail near black, and obviously you'll be losing white detail near white.
The black bars may become obscured using a very high APL pattern (like the half-white pattern in the advanced menu) if your system has very low ANSI contrast. With most digitals, however, this is not really a problem because the black level of the display is elevated enough, and ANSI contrast is high enough that the visibility of the bars doesn't really vary with APL. On CRTs, this is more complex, because if you throw up a full black pattern with the bars and calibrate, then switch to one with half gray or white, ANSI washout will render the bars invisible. On CRTs then it is a little more complicated because the ultimate black level you arrive at will vary depending on the APL of the pattern, and the pattern you choose can depend on your preference for total black-out, or rendering all the shadow detaisl even in bright scenes (high APL).