I really appreciate you looking this up. Now it is clear that these claims are controversial.
Nevertheless, the question still is what learning ability refers to: Is it the ability to comprehend learning material that explains the topic well, or is it the ability to come up with the simple explanations yourself? It seems that the OP refers to the latter. The first kind probably has lower variation. Also, this means that when measuring learning ability, you should ensure that all involved people have access to the same “source”. I would be interested in hearing the OP’s thoughts on that.
I really appreciate you looking this up. Now it is clear that these claims are controversial.
Nevertheless, the question still is what learning ability refers to: Is it the ability to comprehend learning material that explains the topic well, or is it the ability to come up with the simple explanations yourself? It seems that the OP refers to the latter. The first kind probably has lower variation. Also, this means that when measuring learning ability, you should ensure that all involved people have access to the same “source”. I would be interested in hearing the OP’s thoughts on that.