And the 7-10 grind was probably only true of year 0-1. RxBar got a lot of traction well before they were sold, and so to believe he was grinding for the entire 5 years in the same way he was in the basement when they first started is a bit naive.
Worse than "overnight millionaire" porn is "hustle" porn. The truth is for businesses that are fortunate to find product market fit the market carries you more than anything you've personally done.