Technology

You mean invested in it. Then took over as CEO when the board voted the former CEO out because he was spending everything they had without getting close to producing a car they could manufacture.
Telsa never produced any cars until Musk was running it.
The continued success under his leadership for the ramp ups for the Model S and and full on ramp up to mass manufacturing the Model 3 kind of demonstrates that. To say nothing of Spacex.
\What did Eberhard do after Tesla again?
Saying he did nothing of consequence at SpaceX would be claiming that everyone who worked with him there is flat out lying. People don't talk smack about their former employers even if they don't like them or think they are idiots.. But they don't make an effort to praise their abilities in that case either. I'm thinking it is more likely that you aren't exactly in a position to know more than they do.

Twitter would be the only mature company with any previous success that he actually ever bought into and the only one he did not build from the ground up. Eberhard building a crap foundation that needed a lot of rebuilding doesn't count.

I know you don't want any of this to be true because he's a dick. But the world isn't a Hollywood movie where the bad guys get what you think they deserve and only the nice people are brilliant.