One use case could be that a complete beginner to programming can enter some natural commands (e.g. "X is a list of numbers", "read 10 values in X") without worrying about the syntax and convert them to a working program in one of the target languages.

Also, the input doesn't have to be in English as it can be easily trained with samples from other languages. So people can write/speak in their native language and get it translated to working code.