Quote Originally Posted by passmeatissue
The spring mounting cannot be considered "rigid" or "immobile". Movement is intrinsic to a spring, and you would only use one in order to allow movement. Otherwise you would use a bolt or bonding. The floor was designed to move, and therefore deliberately contravened the regs.

The springs were visible, at least from the side or below, so a car with a sprung floor should have failed scrutineering.
I would imagine that Ferrari would say that the springs acted as dampers or limiters on the flexing of the floor. From the drawings I have seen, that is entirely plausible since you wouldn't want the floor to deflect too much and dig into the track. I'm not sure if the McLaren or RedBull designs used springs since I haven't heard much about their designs.

I doubt the scrutineers would fail the car just because it had springs present when it still passed the (then current) prescribed tests. The only basis they would have to disqualify a car is if it failed the test that was used at the time. That would make the device illegal.