I would have loved to continue reading this, but he immediately claimed that "Black students are 66% less likely to be identified as gifted compared to white students with similar test scores". I clicked the link that supposedly contained the paper to back this up. The link takes you here[0]. That's a bit annoying since it doesn't take me directly to the source, but that's fine. Then I read the article and it says: "…
... Which would indeed be explained by the lack of gifted program at schools (can't assign a kid to a class that doesn't exists).
But there's also something the authors are omitting here: parental involvement. It's still the parent's decision to place their kid in a gifted program. And if there's no gifted program at the child's current school the parent will have to take the initiative to transfer his child to another school (and the child will probably object to it seeing as it means losing all his friends).