Problem is, as the article itself points out, is that the Egyptian never described people in race rather culture.
An Egyptian who then lived in Nubia would be considered a Nubian and a Nubian or Libyan who decided to live in Egypt would then be considered Egyptian, because they adopted Egyptian culture.
Problem is there are so many racists in today's world it's kind of impossible to fathom this. What 'race' were the Ancient Egyptians? Perhaps just Egyptian?