I would say, in both pics a light car is parking next to a dark one. As the other cars in the pics also have no shadows, these 2 cars don't have shadows. And when you look in the first pic straight to the top, there is another dark car parking among the others. That looks pretty the same like the "shadow of the hovering car".
The eyes and the brain see what they want to see, a hovering car. Sorry, call me an illusion killer