Yes, although DNA per se means nothing. As humans, we share 99.9% of our DNA and races don't exist, so it doesn't matter if someone had an African or Indigenous American ancestor in the XVIII century. Like most Puerto Ricans and Argentinians, many Brazilians carry an Indigenous American mtDNA haplogroup but they have no connection to any actual tribe. Likewise, many are descended from African slaves, but that doesn't mean they're culturally "African". These slaves would rarely teach their native language and culture to their children.