There is the reality that ~ 10% of the population has an IQ so low, US army cannot recruit them by law. 10% is a lot of people, a few tens of millions in US. I have someone in the family that has the mind of a children of 8-10 years old, for that person a "low skilled" job in an Amazon warehouse would be excellent; the alternative is zero income.

There's also a IQ != skill.

But I believe your specific example here fits the "depends purely on a skill that can be developed, as opposed to natural talent/advantage that few people have".