Is indie music no longer indie if they sell really well? Is an indie film no longer indie if it gets too many awards? This kind of redefinition of indie as "poor people" is ahistorical and unhelpful. Indie means independent of a major studio. Which they are.

If your studio has enough resources that it could easily be its own publisher, the definition "independent from a publisher" is no longer of much use. It's also wrong: this project did have a publisher and various other investment in it.

The founders of this studio come from rich family backgrounds, to think they have anything in common with what the average person understands as an "indie game" developer is laughable. For example, they supposedly rented an office to work in, in a building owned by the founder's father's real estate firm, of course.

Projects like these used to be called AA games. It's a fantastic game, it doesn't have to be indie to be good.