I don't think this is worth debating. I stand by what I said about this thread, but the question of what Scott Alexander meant is not in doubt; it's clarified in the email.
jasonhansel takes issue with the idea that there are racial differences in intelligence
You take issue with another, related, one of HBD's ideas: a specific ranking of races by intelligence that it advances.
I was only supposing that the first claim seems likely to be true, so I'm not sure that there has been any substantive disagreement between us on those two matters.