3. Is it a CASE Tool?

Yes.

Genesis V is an advanced example of Computer-Aided Software Engineering.  It is, of course, registered in IBM's SAA(TM) Catalog.

That said, we prefer now not to refer to Genesis V as a CASE tool.  Typically, such tools have noticeably failed to achieve their productivity (or accuracy) claims.  As a result, they have generally become associated with a theoretical, academic approach able only to work in some imaginary ideal world.  Above all, Genesis V is a practical  tool.