I disagree. Audi has a history of making concepts with little bearing with reality. And while I expect them to shop something at some point, I do not yet trust that they take BEVs seriously. Their use of the MEB platform, for instance, rather than a dedicated BEV platform demonstrates a lack of commitment. The specs are all extremely speculative since they don't yet have the battery chemistry. And the specs they do provide... about 220 miles of range with 83 kWh battery is underwhelming for a 2018.model, much less a 2020 model. And without a massive battery factory investment already underway, their ability to make any real quantities of this vehicle in 2019 is unlikely.
So Elon's tweet carries far more weight than this concept vehicle.