Not quite sure what the "dog whistle" was that you're referring to...please explain that!
The statistics show significantly lower marriage rates among black families (moreso correlated to poor families, in which black folks over-represent). The thing not shown in the statistics is the number of families where parents are together, but unmarried (and oftentimes reporting different addresses) because they get SIGNIFICANTLY more benefits that way. So...the family unit is there, but just not formalized. And people are just responding to the incentives in front of them.