Now, as an AP State Scholar I will chime in with a couple of takeaways:
1. AP credits like this typically only count as elective credits when you go to college. I passed multiple AP courses that amounted to elective credits in college. I had more elective credits than I needed for my major, however, I was still required by my university to take a cross cultural elective, which ended up being the History of Jazz. This requirement didn't really enrich my college experience and provided nothing towards my career. Ironically, had African American Studies been an AP course at the time and had I taken it and passed it, it would have actually filled the cross-cultural requirement that the other courses (like U.S. History) did not.
In hindsight, this requirement was more of a method for the colleges to find work for people with the gender and ethnic studies majors whose real-world prospects were limited at best. Ultimately, these requirements increase the cost of an education while contributing little. Looking back, I would have loved to have taken another finance course instead of the History of Jazz (as it was, I graduated with about 20 more credits than was required for my major).
2. There are no other ethnic American AP classes. No AP Irish American History. No AP Slavic American History. No AP Chinese American History. No AP Latin American History.
3. As noted in #1, it's elective credit. A lot of the classes that people take in college have little bearing on their career. The relevance of some of these courses to employers is they prove that for four years of your life you were responsible enough to show up, on time, take orders and work diligently. In this regard, this course would fulfill that requirement. If such a course motivates those who are historically disengaged in the education system to show up for class, work hard and try to achieve, then it is a win for the education system and should not be discouraged or prohibited.