I posted an article published by the SMH back in June 2022 saying why those proposing a new stadium over the rail lines at Central was never going to happen (link to post which has text of the article -
https://forums.leagueunlimited.com/threads/future-nrl-stadiums-part-ii.445841/post-15259027).
So its flogging a dead horse to ever think it was going to happen.
As to the SCG and the SFS lands, people do forget that those ground are actually held in a trust which has very restricted usage permitted on it. No NSW Government can just unilaterally decide to sell it or to change its usage because of the conditions laid out in the trust deed, and also because those conditions are also specified explicitly in legislation. As such what Government is going to build yet another stadium around 5-10 km away from where it already has two? That's the other reason a stadium over the top of Central was not going to happen. It was pie in the sky as it did not address those realities.