No, the sun unfortunately does not put off 1 color at a time, I will give u this, dependant upon time of year and sometimes day the GENERAL spectrum of the sun will APPEAR blue, or red (cool or warm) however its ignorant as shit to suggest underlying spectrums containing P.A.R. In almost every nm range and color temp. So the reason his answer is good is because a rounded spectrum that brings all elements neccesarry for photosyntesis will always produce happier plants. Or just cause works just as well.
That said for veg I personally would do 75/25 cool/warm and the opposite for flower.
If the sun doesn't show ALL spectrums at about all times, how is it I can get a sunburn in fall? The sun should be warm right? No blue no uv-b. Just saying. I know its not the most common knbowledge but saying things like the sun is only one color is like claiming to have invented the ? Mark. No one should take that seriously