Its kind of what Cervelo’s original claim to fame was - how you could barely slip a playing card between the rear tire and the concave seat tube. In this case I’d be more concerned about the bike’s performance in a cross wind, and the instability from the center of pressure being so far forward. I hadn’t heard of the designer before (Kevin Quan Studio in Toronto) but he seems to do nice work judging from the other bikes he’s worked on.
In my experience wind tunnel testing for bicycle design has been done for validation toward the end of a project, once the main design is already done. It is also helpful for athletes to get on the bike in the low speed tunnels to tweak their riding position since that will have a larger effect on drag. Specialized is the only major manufacturer that I know has their own tunnel so their ability to design with the aero factors should result in the best performing bikes (Venge, Shiv). DB is not a large manufacturer and tunnel time is expensive.