Yes , definitely heard of it before. To me this problem is sort like when Visual FoxPro appeared and everyone was thinking about upgrading their old FoxPro for Windows\DOS applications, and asking if they could just convert the projects and hey presto. But in the end the answer was usually "yes there are conversion tools but in the long run you will be better off rewriting it". And that was a situation where the language was the same.
if your VFP project has good separation of UI and core functionality, with the latter in testable programmatic classes then a tool like this could definitely help move some of the programmatic classes to C#. However personally I wouldn't trust the resultant code at all especially if 'AI' is involved, and I would be making very sure my unit\integration tests were good.