You're too optimistic about what it can do, here's a sample output: https://github.com/endrazine/wcc/wiki/wcch

This is not what I'd call an "API dump"; all prototypes return void pointers and allow any arguments.

Hence, it's just as much of a blackbox as the original executable is because you have no idea what the functions do, what arguments they take and what values they return.

I don't know, having the ability to compile your own test driver against it rather than manipulating the executable is what I'd be after with the tool. You may be reading too much assumption into my comment.