Were they genuine concerns, though? The overall impression from available sources is that he was overreacting to a situation that, while perhaps unusual, was basically par for the course given that Gigafactory itself is a newly-built facility, and one that's still largely under-construction. Why would you expect things to be 100% perfect and with zero unnecessary waste? Screwups happen all the time, most of the time it's totally normal and not a big concern.