This made plenty of sense to me, and bears out my own observations, both in relation to the severely diminished value of 'hi vis' colors at night, and in relation to the value of motion with regard to identifying a subject in the dark. Reflectors on fronts and backs of bikes seem all but useless, but pedal reflectors tend to stand out. Likewise, runners wearing the reflective waist belts are not as visible as runners with good sized reflective bits on their shoes or pants.

supposedly, the military did some studies some time in the past, and determined that the 'color' which is most visible under the greatest range of light conditions is: White. This does not diminish the value of reflective gear at night, or hi vis gear in daylight, but if you are stuck without specialty gear, wear white, esp. at night.