The video you have linked to was apparently shot in 1976 in Papua New Guinea (which is an island just north of Australia). It is a fictional video, not a documentary account. But the time this was filmed, the tribe had decades of interaction with white outsiders. As this article discusses, there was a wave of journalistic interest in these so-called "lost tribes" in the 1970's. None of them were actually "lost tribes." They may have escaped direct colonization and had limited interaction with outsiders, they all had some prior and sometimes ongoing contact with outsiders including trade. While some members may have remembered what it was like to live in pre-contact times, none of the tribes was still living with "stone age" technology and they all understood that white people were just people who came from far away.

I am not an expert in first contact between Europeans and other groups around the globe, but I do have enough anthropology background to say that a lot of what we think we know about first contact is more based in European mythical accounts than in solid data. In other words, they are stories told by Europeans who are imagining or interpreting what indigenous groups are saying or thinking during contact. We don't have many accounts from the point of view and in the words of the groups encountering Europeans for the first time. In reality, global trade networks existed long before the age of European colonization, so there were many groups that either had a good knowledge that the world was much larger than their local area, or that had a history of interaction with European or other empires. So for example, if we are going to look at Africa, we have to remember that North Africans had centuries of direct interaction with Europe -- Morocco had invaded Spain and ruled an empire from there for 700 years. Carthage (in today's Tunisia) was a powerful force in the ancient world, as were Egypt, Nubia, Axum, etc. Trade networks across the Sahara meant that groups in the South who had never seen white folks probably had seen people of various shades, and heard stories about the wider world that might have included stories of very light skinned people. Humans do have a basic level of intelligence, and if you know that horses and dogs come in lots of different colors, it's not all that surprising to find out that humans do too. That is not to say that you did not have isolated societies or individuals who were shocked to see their first white people, but to make the leap to assuming that they saw white folks as gods or supernatural beings is more about the European imagination than the actual experiences of non-European groups.