Is the Apollo Gumpert's claim that it can drive upside down at high speeds genius marketing, or just plain ridiculous?

Also intriguing is the claim that the Apollo Gumpert aerodynamics allow it to drive upside down in a tunnel in excess of 190 mph. But this claim has never been tested, and it's now part of the car's lore. The question it raises is whether it’s innovative engineering or just marketing hype in the automotive world. Is this is a stroke of genius that holds the imagination and demonstrates the car’s extreme performance capabilities? Or is it just an outrageous statement that makes the brand look embarrassing? Of course claims like these have impacts on public perception, hyperbole plays a role in supercar marketing, and how feasible the claim is to begin with.