It's not just casting. Right there in the second paragraph of the TFA:
> Tesla has been a leader in gigacasting, a cutting-edge technique that uses huge presses with thousands of tons of clamping pressure to die-cast large sections of the car’s underbody. On a typical vehicle, the underbody can consist of hundreds of individual parts.
Also, other car companies are copying Tesla.
> Japan
> In June 2023 Toyota announced that it was adopting casting technology for its electric vehicles.
> In 2023 Japanese auto parts supplier Ryobi announced plans to cast large electric-vehicle body parts and expects to reduce car body manufacturing costs by 20%.
> Volvo
> By November 2023, orders had been placed for two 9000-tonnes-force Giga Press machines for a new Volvo electric vehicle factory at Košice, Slovakia.