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I believe the point is to do much of the analysis on a lower resolution video, then reuse that analysis with the higher resolution while still doing some refinement to fine tune the analysis for the full resolution. This gives a speed boost while also not lowering the quality too much, like simply using the analysis done on the low resolution video directly would.
I am not sure I would do this, but then I tend to run far up the quality/speed curve, e.g. preset veryslow with a few extra options that slow it down even more. It would be interesting to see the speed and quality impacts from using this method compared to slower or faster presets and/or other options.
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