Also, its "Star Citizen" that cost $415 million (according to google). Starfield clocks in at $200 million. Still larger than BG3, but the correct comparison is a lot less dramatic.
The starting budget was $200 million, but I've read that the final estimated budget was much higher, at $400 million.
That being the production budget, to my understanding. If film is any comparison, that's not including the marketing budget, which for Starfield is likely enormous.
Whereas Larian achieved great success with minimal marketing dollars.