And they will have high enough IQ to maintain and improve them as they wish. Without say IQ of 100 or more maintenance of advanced robots could be problematic.

Increasing IQ without reforming the culture is just a mean to crush opponents in Chinese social darwin scheme.

This is overstated. Plain IVF today in the US costs tens of thousands of dollars. As a result in 2014 it was around 1.5% of births. Some insurance will cover IVF but is more expensive and there are generally caps. Its only accessible to the relatively well off and that's unlikely to change in the short and medium term.

So even if development of embryo selection technology proceeds rapidly it would only be available to the super rich for quite some time.

But I'm certainly not a psychologist.

Actually, I'm not sure whether "5 to 15" isn't meant to describe the standard deviation, in which case screening lots of embryos might even produce much higher gains.