Looking at these numbers I have the feeling they had problems reaching Democratic-leaning native Alaskans. They have Trump winning non-whites 40-39.
I think I saw a deeper dive from the pollers online that said they reached a fairly reasonable group but had a hard time reaching North Slope native Alaskans... they didn't really reach anyone in Utqiaġvik, for example. So their crosstabs on native Alaskans came with the caveat that, if the groups vote differently from each other, there might be some interpretation challenges there.
