IQ alone is no longer, and has not for a very long time, been the deciding factor in whether or not someone is intellectually disabled

The reason that an IQ of 60 is considered intellectually retarded in the Western world is not because the IQ of 60 makes someone retarded, it is because this level of intelligence is so rare in the general population that it is more likely than not that that person has such a low IQ for a reason other than simply being on that end of the bell curve. For example, being intellectually disabled. There is some environmental effect in Africa.

Flynn effect is mostly explained by non-g, some studies score differently because they are just bad studies for some reason or another or there is just different methodologies that produce some noise. and Haitians definitely do not have an IQ of 98. sebjenseb.net/p/average…

Most hereditarians I’ve spoken to agree that African IQ is low partially because of environmental factors, most likely those non-g factors that cause the flynn effect. If Africa was like the US it would probably be more like 75-80. Also, Africans in the US are a bad proxy for Africans proper because all African Americans have White admixture, sometimes very high amounts, and American-Africans are undergoing a selection effect.