Not sure what you meant by “that’s not true”. He was clear that they raided other Indian tribes (not getting slaves from your own “people” meant their own tribe) - but that they didn’t have another name for the other tribes. Not having another name for them seemed odd, but that’s what he said.
When he said getting wives from other tribes, it came to mind that they must have figured out the problems with too much inbreeding.
“Not having another name for them seemed odd, but that’s what he said.”
He was probably just jerking you around.