The problem is that there is no way to know what this fella would have liked. His existence seems lonely and generally miserable, maybe he would have preferred to be contacted? Or maybe not and he was content living on his own? Right now there is no way to know. I don't think that asking people "hey, what would you like?" is "hurting" them; quite the opposite actually.
Furthermore, many – though obviously not all – people are generally quite happy to share aspects of their culture and languages, especially when they know it will die out.
Of course, actually communicating with this man has some practical barriers in terms of language but also trust considering his tribe was murdered, but I don't think it would have hurt to try and ask, as long as you don't force anything.