No, they made it because they can throw the ball. Everything in the NFL stems from that. Balance is a product of being able to throw the football. So yes, you need balance, but you can only have it with a great passing offense.
There are 8-10 teams who can throw the ball, there are 8-10 contenders. I am absolutely dismissive of any other factor - outside of maybe passrush - being relevant to success. They are not. The correlation between passing EPA and success is basically perfect. Championship Game rankings in passing EPA:
2020: 1, 3, 4, 5
2019: 1, 4, 7, 8
2018: 1, 2, 7, 8
So I'm not really interested in hearing about how you need to run the ball, control TOP, or whatever. The path to consistent success is throwing the football, and the rest falls into place behind it. Brandon Staley, who had the best defense in football last year, said specifically that he cared almost exclusively about giving up big plays in the pass game.