This is absolutely false. I agree that discovery isn't easy, but you know what's even harder? The other 90% of the work needed to finish it and make it a reliable product. Chomsky trivializes the work of synthetic organic chemists, the engineers that set up and keep production lines going, researchers that test the drugs, and so on.
In software terms, this is like saying that all the hard work is done because someone banged out a prototype over the weekend. It's full of bugs and doesn't have the features people want yet.
If you believe that Chomsky's right, try running a startup while holding his idea. You'll fail, or you'll discover that it's not easy and reject his idea.