Probably not. Based on the explanations above, an RGB-patterned reflector is unlikely to give a meaningful advantage over a normal reflector.

From a lighting/optics standpoint, mixing red, green, and blue patches across the reflector should average out to roughly neutral light at the subject, not magically create richer color. What it can do is waste light: colored areas reflect only part of the spectrum efficiently, so overall output is reduced compared with a white or silver surface.

Also, digital camera sensors already use color filter arrays to separate red, green, and blue information. A reflector with RGB dots does not inherently “match” a CCD or make color capture better. If anything, it adds another filtering step before the light even reaches the subject.

If the pattern is small and the light is well mixed, the effect should be mostly just dimmer neutral light. If it is not well mixed, you risk uneven color contamination. Either way, the marketing claims sound doubtful without strong side-by-side evidence such as identical RAW comparisons.

In short: treat it skeptically. A standard white, silver, or gold modifier is the safer and more predictable choice.