Indeed. He has two other (earlier) videos of him building gardens, one with cassava, which he says is a very high-output food source. He also notes "A person could potentially be nearly self-sufficient from a small plot of sweet potatoes." Presumably it should scale for a small group, since they could share the work.

https://primitivetechnology.wordpress.com/2017/02/24/plantin...

https://primitivetechnology.wordpress.com/2016/05/20/sweet-p...