Their source indicates that Snyder is looking to take a similar approach to creating the Man of Steel that's being done with Green Lantern, which is to enhance him through CGI. Goode is about 6 foot 2, but he's slight of frame, so by using the computer animation they can buff him up.
It's been widely reported that Warner Brothers was looking for an actor around the age of 28-32 for the role, and was open to the idea of using an unknown actor, possibly even a TV actor to build the franchise around. Goode is currently 32 years old, and while he's had an impressive career with major roles in acclaimed films like A Single Man