The livery is just for fun - deliberately robbing key design elements from the Audi Sport colours of the time - and also a few key Audi sponsors.
The roots of Audi's idea for a high-performance four-wheel-drive car go back to a meeting in February 1977 - a proposal made by Audi's chassis engineer, Jörg Bensinger to Ferdinand Piëch, The car received the backing from the board of management of Audi in September 1977 - and Audi introduced the original Quattro to European customers in late 1980..
So for fun - in my story, I've imagined the '77 Audi meeting ended badly. Piëch rejected the idea . .Bensinger knew that 4WD was the future, so took his thinking (and contacts) to Talbot instead.
"Real life" big things are usually the result of small circumstantial changes and serendipitous encounters - it often doesn't take much to change a course of events significantly once a thought gathers momentum.