Some Native American tribes enslaved Africans.? Some of these Africans accompanied 46,000 Native Americans

http://www.npr.org/sections/thetwo-way/2017/08/31/547705829/judge-rules-that-cherokee-freedmen-have-right-to-tribal-citizenship

Dear students, 

Some Native American tribes enslaved Africans.  Some of these Africans accompanied 46,000 Native Americans, members of the 5 Tribes, who had been forced to leave their lands by the U.S. Government with The Indian Removal Act of 1830; they walked 1000 miles to the modern-day state of Oklahoma:  https://www.smithsonianmag.com/smithsonian-institution/how-native-american-slaveholders-complicate-trail-tears-narrative-180968339/

First, please click on the above link to read this NPR article on Cherokee Freedmen.  Then, please read the article in Smithsonian Magazine.  Was this ruling correct or not? If yes, why? If no, why not?