They are - the one you posted is the old Bald Hill site, they've since decided the McGregor site is better
http://www.starnewsgroup.com.au/news/pakenham/244/story/89246.html
Sounds like that could be an old article, they seem like their ready to break ground this year. The age article mentions McGregor Rd which is shown on the right of the other track plan
Edit: Seems to be from a May 09 motorsport news mag