That clip lacks context. Before that clip he was talking about engineers/designers. I think that documentary is just poorly edited, they interspersed Steve's monologue with something that was only loosely related to what he was saying. Manufacturing is labor, it doesn't require much brains. Whoever manages a team like that probably doesn't need to have much experience being on the ground floor.

Here's a longer clip (uploaded by Andy Hertzfeld himself!) which has more context: https://www.youtube.com/watch?v=l3agg64LM88