On the one hand, this rumor seems nonsensical and illogical. On the other, we know that Audi and German manufacturers, in general, are not always the most straightforward when it comes to naming and marketing cars. Mercedes used to sell the 6.2-liter V8-powered C63 with a badge that indicated it had a 6.3.
If that’s not proof enough, take a look at BMW. Some years back, the Bavarians decided that sporty cars should have even numbers and more everyday cars should have odd ones. Hence, the 1 Series Coupe became the 2 Series Coupe, and the 3 Series Convertible became the 4 Series Convertible. That made sense, but shortly after, the company released an MPV with the 2 Series Active Tourer name, claiming that the family car needed an even number because it was too premium a product for the 1er range. Then came the 2 Series Gran Coupe, which is neither 2 Series-based nor a coupe.
Trust the Germans to build good cars, but don’t expect them to name those cars in a sensible manner.