That has not been my experience with the Alt-right at all. The media focuses exclusively on the fraction of Alt-righters that promotes whiteness, but they are the minority.
Read their publications--Takimag, V-dare, Daily Stormer, The Right Stuff, Right on Radio--the key component is white identity. What exactly this means is still debated but at bare minimum they wish to see a return to pre-1965 demographics.
There are cross over groups--neoreactionary, nativism, basic American nationalism, anti-feminism, traditionalism.
There is a large debate right now over what is considered alt-light and alt-right with many prominent personalities having some public clashes.