Firing an employee and then begging them to come back because of how essential they are? Art of the deal.
Typical Elon style - Fired entire Supercharger team, then hired right back. Maybe for PR. Same stunt with Tesla stores and Twitter. He fired Twitter's 80% team is a lie.
Imagine structural engineer thinking like this.
I'm not sure if that was how it really worked out.
Then you are wildly mistaken about the field of engineering.
Imagine needing to add back 20% to a bridge because you removed too much, or a rocket ship, or a team of nuclear scientists (like is actually the case here).