Nowhere in the snippet there is a statement of Brawn that they did this for Schumacher.
The text refers to Schumachers rocket starts helped by the short wheelbase due to more weight on the rear wheels...journo babble and mixing facts with things they want to see..Schumacher had always good starts or good first laps since his comeback .Thats a factor of his experience and eagerness nothing to do with the cars wheelbase.If that were the case both drivers would have exceptional getoffs again and again .Rosberg does not stand out in this.