Knowledge of IQ score information can shed a lot of light on this story. 130 IQ is the usual threshold used as where "gifted" is said to begin (though of course in a school context, particularly kindergarten, they aren't testing in order to place kids in a gifted class.)
At 130, and for a good distance before it and after it, there is a much higher percentage of whites than blacks. So that would go a long way toward explaining why gifted programs aren't "diverse enough." It's not that there aren't ANY blacks scoring in those upper tiers of IQ, it just isn't very many. And of course there's also just the simple fact that there are still more whites than blacks in the country, which also helps a lot in explaining low representation in these classes. Remember, nobody disputes THAT the scores fall in this pattern and have for decades, only WHY they do.
This has explanatory power NO MATTER WHAT YOU BELIEVE THE CAUSE OF THIS GAP IS - you can believe it's institutional racism, the cycle of poverty, malnutrition, fatherless homes, culture which discourages academic pursuits, white privilege, whatever... pick whatever causes you want. Again, the gap itself is not contested by anyone, and while it remains a fact it is going to have real world implications like this.
So if we decided to shut down gifted programs until we made the score gap disappear entirely, I'm not sure when we'd ever have gifted programs again. Unless you think we're on the cusp of eliminating "white privilege" and all those other possible causes. To me they seem pretty intractable.
But if people are just saying "kindergarten is too early to start gifted programs" - I really don't know how to respond to that. You may have a point, but I'm not a teacher and I don't know how early they can identify giftedness nor how beneficial it is to children to get started on a gifted track of learning as early as possible. I really am unaware of that information. What I do know is that the article described the program as "popular" which would seem to indicate that kids were getting something out of it. Therefore it seems a shame to me that it is being taken away from them or messed with, especially in a way that seems to really demonstrate a lack of knowledge about why that non-diverse result should have been totally expected.