I think you've misunderstood the comment you're responding to.

They're suggesting that to give the optimal assistance to those countries, the IQ of the current adult population needs to be considered as an important variable in the equation, but it's taboo and stigmatized to discuss or acknowledge, so the people get sub-optimal solutions instead.

If you want to help some community in need, but you're not allowed to address certain taboo topics- IQ, substance abuse, STDs, domestic abuse, religious beliefs or cultural norms, whatever may be relevant for that group, then you're probably not going to design your programs for assistance in the best way.