That answer from NASA is incorrect. The visible light area of the spectrum is a wash, but not the UV light area of the spectrum.
What specifically are you referring to? What do you mean by "the visible light is a wash"?
From the NASA piece...
"However, there are more important indirect effects: sunspots are associated with what we call "active regions", with large magnetic structures containing very hot material (being held in place by the magnetism). This causes more ultraviolet (or UV) radiation (the rays that give you a suntan or sunburn), and extreme ultraviolet radiation (EUV). These types of radiation have an impact on the chemistry of the upper atmosphere (e.g. producing ozone). Since some of these products act as greenhouse gases, the number of sunspots (through association with active regions) may influence the climate in this way."