And gets it very, very wrong. "Intelligence" moves around with nutrition, stress, sleep, pollution. The brain is organic. We miss out on human potential in all the neighborhoods around the world that aren't safe and supported. The good news is we are headed in the right direction as a planet, but surprisingly this article doesn't mention it [1].
Your statement would only work as a rebuttal of parent's argument if everyone in the west had equally good nutrition (from birth), stimulation, emencouragement asand education as these factors are suspected to be behind the Flynn effect.
I was just countering the parents argument that we are heading in the right direction - sure there is still some individuals that will benefit from whatever drives the Flynn effect but overall it is now insignificant.
[1]https://en.wikipedia.org/wiki/Flynn_effect