That would be much more convincing coming from literally anyone other than Kanazawa. It takes very little charity to interpret his critics as saying, not "Your theories are inherently racist" but "Your theories are only some of many compatible with your findings; you are privileging them because you are biased in favor of hypotheses that postulate certain races naturally do worse than others".

I don't know what to learn from the quote. It's literally true, but it's also clearly unhelpful, since Kanazawa writes this while following non-truth-seeking algorithms. Maybe the moral is "If someone calls you a mean name, address the content of the criticism and not whether the mean name applies", or maybe "Don't be a giant flaming hypocrite".