It seems a solid idea. Reminds me of the slots on the front of aircraft wings. I think of three effects that can diminish its benefits.
1. I don't know if the lift that tomislavp4 mentions is related somehow with the air you wish to direct to the undertray. In this case, maybe part of the downforce generated in the Manchild Nosecone could cost downforce at the undertray, because it would rob it of air.
2. The air that exits the "slot", in front of the "windshield" also interacts with the upper body. I don't know if the current body design has the "wrong" shape (it's convex) or what effect has this air on the body.
3. From intuition, it seems to increase drag. The car has two noses now and the "second" one is blunter than the current one.
I can think of three good things:
1. It's cool.
2. I think that the frontal crash tests would have no problem (after all, you can design the shape of the beam box that connects the "new nose" to the rest of the car to give it the rigidity desired, at the cost of section of the air passage. Maybe the critical forces would be lateral. Are there lateral crash tests?
3. Again, the design offers a "crushable volume", with two separate sections that could be designed to "collapse" in front of the driver. That maybe can be used to diminish deaceleration exerted on the "main body" on a crash. It's like a front wing on steroids in this sense.
... and a happy Friday afternoon, btw.