You will notice that they talk only about how they LOOK, not how well they allow you to see.
I fully expect that they will not improve night vision. If they did, they would have touted that in the ad. In fact, this blue color effect is because of a different wave length of energy. That's what color is, different wavelengths. So I expect that this particular wavelength actually provides less vision because there is the same amount of energy, but at a less efficient wavelength.
The reason that the HID's give MORE vision is that they provide more energy. Maybe this wavelength is less efficient, but since there is so much more energy, it provides more vision in spite of the less efficient wavelength.