What is handmade soap? Why is it different from other soaps?
He's literally using his hands to make it. Yes, Russ is also holding an immersion blender, but there's no heavy machinery here. Each batch is mixed by hand, by definition.
The process of hand-making soap isn't new! It's centuries (probably millennia) old. In the extra old days, they used soda ash from fire instead of sodium hydroxide.