I don't understand why you are hostile to me explaining the idea. In any case, you can read their book to see the arguments they use (which are not just assertions, anti-chomskyans just ignore or strawman everything he says). For example, it's not a massive mutation, but specifically a very very small one: the theories called "minimalism" for a reason.
Probably not to you explaining the idea, but to Chomskys ideas that have not been panning out well lately.
Genetically is seems it's very unlikely there is a single gene spot that explains human language but a confluence of different factors feeding back into one another in linage we do not have genetic access to at this time. We've done a bit of gene testing around this now, and single gene flips aren't near enough. I think the best analogy would be like playing a video game where you have to flip a number of switched to the correct position to get the system to work together.
Again, I don't think you understand the substance of the claim. Have you read the book? Mutations don't need to be single gene flips and I don't understand why you think Chomsky thinks that. He compares it to the evolution of the first photorecepetive cell, e.g. a qualitative jump, but that the mechanism is likely quite simple in order for that qualitative jump to be possible.
People really do flagrantly misrepresent his claims.
