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If you ask me, they are fooling us. I am in the publishing business and from my experience with image reproduction, they are saying nonsense. It has nothing to do with ppi's.
What they say, that the screen has been running at 100 dpi in a low resolution as calculated above. But if you run a screen in a lower resolution, it is getting blurred and that always causes a loss of contrast. Increasing the dpi rates keeps the image sharper and causes higher and better contrast.
Imagine a line in a low resolution. The line goes not straight from white to black, it has a shadowy region, because it is interpolatet with the region around. In higher resolution, this "shadows" get much smaller and you have a more brilliant line. The contrast is better in high resolutions.
For me it sounds that they wanted to say something very technical which we have to accept. Sometimes we do the same with our authors :-D
Playing with "waveforms" whatever that means is maybe more the case here.
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