I think the Yann's main point is that this specific model's racial bias was a training data problem; Gebru has not provided any evidence otherwise, as far as I

I think the Yann's main point is that this specific model's racial bias was a training data problem; Gebru has not provided any evidence otherwise, as far as I know, apart from repeatedly asserting that better training data won't fix the problem. It would indeed be a valuable contribution if Gebru could have shown how better training data would not have fixed the problem (e.g. by feeding better training data to the same model and still reproducing the issue). But as it is, she is asserting that better training data won't help without proof and not recommending any alternatives, while taking a hostile tone of conversation. I would be hard pressed to take her claims as good faith criticism.