You should've just taken my advice and read the article.

The remains Zimbabwe are after are from 1890. No known ancestors.

I appreciate your lesson on DNA extraction and study, it's genuinely interesting, but it's not relevant. This repatriation with Zimbabwe has been ongoing for almost a decade, the first iteration was just like this, Natural History Museum saying "we have some remains from digs", and Zimbabwe saying "We have found Nehanda!". Zimbabwe can't confirm who the remains belong to so they will just assume, as they already have.