Earlier quoted context omitted.
A pillow doesn't need to be a factory-made product that you buy at a store. Plenty of humans make pillows out of natural objects when sleeping outdoors. I can totally imagine a mountain gorilla using a chunk of wood, or even a body part of another gorilla, as a "pillow" if it makes them feel more comfortable.
Yeah im sure there are many tribespeople with pillows. It feels wierdly racist that this guy is acting like people in societies like this just live instinctually like gorillas and don't actually have the universal human trait of creating and relying on manmade tools.
You can look at the COVID pandemic for an example of how body positioning has helped change how well people can breathe. Proning of severely sick patients substantially improved outcomes. That's literally just rolling the patient from their back to their stomach. So there might be something interesting there that we can learn if we pay attention. And he's trying to say "we can learn something from these people if only we pay attention."