Those bell curves don't control for environmental and other non-genetic factors, making your statements - insofar as they are based on the document you linked - irrelevant to the conversation.
He wasn't commenting on which factors cause difference in test scores. He was simply saying that the test scores are different.
But it's become an unfortunate pattern that when people bring up the difference in scores, other people (like you) presume that mentioning the correlation data itself is akin to arguing that they are caused by genetic factors, and then attack them for not mentioning the environmental factors.
But it's become an unfortunate pattern that when people bring up the difference in scores, other people (like you) presume that mentioning the correlation data itself is akin to arguing that they are caused by genetic factors, and then attack them for not mentioning the environmental factors.