For a regular car this is useful because the space all the shafts taking power from the ICE to the wheels can be used for something else. For a race car there is plenty of space for those shafts and you don't have anything else to put into that space if you could. This the reason this was developed doesn't apply to race cars.

Of course for race cars they are concerned about weight and performance. Not having those shafts may be better for weight and thus worth it (assuming a EV race care), or it might not make a difference. This might have some other advantage in racing applications that the designers haven't even realized yet.