Fire making, clay pots, mud huts, stone axes, rope, hunting weapons -- these are what kept people alive for eons, and ironically in our modern high tech era, many if not most of these skills are largely forgotten by all but a few remaining primitive tribes and archivists like him.
These videos are worth watching not just to celebrate these high achievements but also to disseminate and preserve the knowledge. Should you find yourself stranded in a forest hundreds of miles from civilization, you may indeed need to build a friction fire, knap a stone knife, weave some cordage, rough up a shelter, and hunt for food.
As a "primitive survival skills" fan (I'm a viewer, not a doer) I have learned so much that I feel a certain confidence that were I to somehow fall off civilization's ship, and be forced to fend for myself, or to help a group of stranded individuals to survive, we would somehow make it.