I disagree. In every sport there have been tons of talented enough teams to win but they don't, or even winning teams have a bad culture (see Lakers)
I think culture helps you supplement and compliment talent; obviously talent is more important and you can win with enough talent and bad culture, but culture allows an organization to replace players much, much more easily, to avoid contract disputes, attract FA, and to squeeze as much as possible out of any given player that you can.
I think it's pretty wild to say that culture is some sort of buzzword. The concept of billions of dollars invested in an extremely high profile company having a good culture isn't unfounded