No it does not. Hypomelanism is a color morph and has nothing to do with size. A hypomelanistic boa will carry a reduction of black pigmentation which gives it that nice pinky-peach or salmon coloration.
If you are looking for a boa that will be slightly smaller than the average BCI, I would recommend a Hog Island boa. These boas are one of the "dwarf" species and don't usually get much over 5 ft or so.
But if you get a normal hypo BCI, be prepared for it to reach 7-9 ft (males will be toward the smaller end of the spectrum, females a bit larger).
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