Ok, he's referring to the product of the giga-press as a work of art.
Too bad they didnt print the engineer's rationale, because that article isn't about that. But it is certainly referring to the product of the Giga-press being cast as opposed to being an assembly. A similar advancement happened in the aerospace industry, except this time the press is already for sale from Italy.
What I would rather see instead of one engineer gushing about a high-end manufacturing process would be Elon investing in automotive engineers who know where to route critical components and how to design maintainability instead of tanking shares on a social media vanity acquisition.
Your investment is safe forever.