I think the comments are a lot more direct and clear than the article, but it’s a pretty good read either way. To quote one of the author’s responses from the comments here:
Two Spirit does not really mean a “mix” of feminine and masculine. Navajo culture believes that all living beings have both feminine and masculine qualities. The Two Spirit tradition recognises that some people can embody a sacred responsibility to inhabit and express feminine and masculine qualities. But Two Spirit people are those who are chosen or recognised as being born in one body and having a different gender identity. They will live as EITHER “masculine women” OR “feminine men.” Two Spirit identities are not simply gender identities. They are part of spirituality. This means they have established religious beliefs, rites, roles and responsibilities to their communities.