Sorry. To be clear: I think strong AI is "fifty years away" and has been for seventy five years.

So yeah, an expert system that can read a natural language description of a feature and ask questions until it has enough detail to generate the code is science fiction in my opinion.

Having said that, maybe it could be achieved in a limited domain, SHRDLU-style. But that's just a way to deal with the ambiguity by excising it.