This is part of why euphemisms are so dangerous - they are often phrases which aren't accurate. Intelligence is not just genetic.

Exactly. It's like if someone would decide that the word "green" is offensive, so we need to use "chlorophyll-rich" instead. Problem is, many green things don't contain chlorophyll at all.

It's teaching people to immediately jump to a wrong conclusion. And adding a moral connotation that who doesn't immediately jump to the same conclusion, is an evil person. (And we obviously shouldn't let evil people teach in schools or speak about education.)