its implied in the definition of the word "indigenous"

The question is whatever time period people discuss, somehow the indigenous people is whoever was there exactly before the time they mean. But people have moved around all through history and killed each other the whole way through so it's always strange. Almost as a rule the "original" indigenous people were killed by the "current" indigenous people sometimes not that long ago before the period under discussion. It think it's better to just use the terms for both groups. Also because it's a bit weird to relegate the conquered group to just "the indigenous", they have a name too.

I understand using the shorthand for encounters of two groups with very disparate technology knowledge like for example during the Discoveries period but when it's so long ago and people had access to "same" stuff it's a bit weird. My comment isn't a slight on the less powerful people it's weirdness with the term.