UNDRIP, in some of its articles, uses the terminology of “indigenous peoples” having certain rights. In other articles it uses the terminology of “indigenous individuals” having certain rights, or certain rights are held by “peoples and individuals”.
In the context of article 13.2 on political proceedings or legal and administrative proceedings, the reference is to “indigenous peoples”. A natural reading of the language there would end up suggesting that it concerns the opportunity of peoples through their representatives to participate in political processes or legal processes. If there is a duty to consult issue where representatives of an indigenous people are concerned, they would certainly have rights that arise due to article 13.2, but it doesn't necessarily imply rights for individual indigenous voters in the context, say, of an election process even while there may be sound policy arguments for that, and welcome reasons for that in light of broader values.
But I don't take the view that there is a specific legal right that would arise there.