For example i think maximum speed is currently limited to 180 KM/H.
Also the wind tunnel models have no suspension whatsoever(as far as i understand), it must be hard to simulate the range of ride heights cars have to work and reactions to bumps, scrapping the ground...
The max airspeed is indeed limited, but so is the vehicle scale. Considering a simulation for the same Reynolds number, a 60% scale model running at 180 kph is equivalent to a full scale model at 300kph, which is closer to the limit of the usefulness of the wind tunnel test.
As for the lack of suspension, it's actually very important that it doesn't have it, because it separates aero performance from suspension performance. The teams will lock the ride heights before each run, and create an aero map they use to do their other simulations, including suspension.